Something else about browsers on this site which you might find useful is here.

(be browser non-specific, and instead have the Extension Categories as Top-Level. Then individual extensions can be tagged for per browser compatibility.)

Note: in most cases herein, any reference to Chrome is probably also a reference to MS Edge, Opera, Vivaldi, and etc. Likewise, Mozilla would be a reference to to Firefox, Seamonkey, Waterfox, etc. Palemoon and Basilisk, however, are some kind of alien mutation of Mozilla which do not work w/ the “new” Mozilla extensions. They don’t really work with the “old” extensions either, but you’d have more luck w/ the old extensions. PaleMoon and Basilisk have their own extension selections (grouped separately here because they are similar, but not the same thing).

Vivaldi

Command Line

Mozilla Browsers (Firefox & Seamonkey & …)

Check out these ideas for how to use native .css to change the appearance of Firefox and other browsers.

https://github.com/MrOtherGuy/firefox-csshacks

https://github.com/mbnuqw/sidebery/wiki/Firefox-Styles-Snippets-(via-userChrome.css)

Waterfox Why?

Go for it. Check it out. You might be pleasantly surprised that you like a slightly different and more customizable interface once in a while.

If you’re using a Mozillla browser, check out Francesco De Stefano. In my experience, he knows what he’s doing when it comes to developing useful and practical addons which aren’t broken for mozilla browsers.

Not to be confused with fantastic guitarist, Peter Di Stefano, though the names are both Patronymic Italian names.

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Extensions / Add-ons

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Bookmark Management

404 Bookmarks

Check whether your bookmarks have died since the last time you visited. Get 404 Bookmarks for Firefox.

Batch Edit

Mozilla – Bookmark Batch-updater (batch edit URL with RegEx option)
Chrome – Bookmark URL Batch Replacer

Random – Just go Crazy!

Click to open a random bookmark from your vast collection of saved URL’s, you hoarder! It’s pretty cool, actually. You’ll never know what you’ll get.
Chrome Version
Mozilla Version ~ by Steven Aleong

Sort Bookmarks

Recursive Bookmark sort for Chromium-based browsers. On demand function. Probably the only one of its type you need. Sadly, not available for Firefox, but there are good bookmark managers for Mozilla browsers too. Update. I have used this with Vivaldi, and was disappointed to find that it didn’t sort some. But, I think that might be a Vivaldi thing (the way it extends the bookmark toolbar, but most people dont keep the bookmarks toolbar visible at all times as I do, so you might not even notice that. The bookmarks themselves actually did seem to be effectively sorted.

Sort Bookmarks for Mozilla browsers. Actually, I wish this one was available for Chrome too. I’ll have to take a look. It’s cool because you can just right-click on any given folder, and that folder will be sorted, recursively if desired. I think there’s a version of this which runs automatically as well.

Spruce

Spruce Marks SpruceMarks is a general purpose kind of Different take on your bookmarks. Worth a try!.

Eliminate Duplicates

Bookmark Dupes – For Mozilla and Chrome. I like using this one first, then the Bookmarks Clean Up. Bookmarks Clean up is nice because it will merge folder siblings having the same name, but will function faster if you use Bookmark Dupes first.


Fast Bookmark Manager – Fast Bookmark Mgr eliminates duplicates and Merges same-name sibling folders. I tried this one not long ago, and was impressed. Correction!… this one will merge same-name folders anywhere in your library. If you’re a Chrome user and need to clean your bookmarks, check out this one first! Also, they weren’t lying when they said fast.

Merge Same-name Folders

Bookmarks Clean Up is essential for anyone who keeps named folders for categorizing bookmarks. Have you realized that you have more than one folder of the same name? Use this in conjunction with “Bookmark Dupes” (link above) to quickly minimize your bookmark collection to having only one version of each link saved. If you don’t have a ton of bookmarks, this can probably be all you need, but if you’ve got a ton of duplicates, you’ll probably find that “Bookmark Dupes” will clean most of your mess more quickly.

Bookmarks Clean up – Mozilla Version
Bookmarks Clean up – Chrome Version

Copy / Convert Stuff

Copy Selected

Copy Cat – Select text on a web page and copy as HTML (or markdown, or other options). Available for both Webkit and Mozilla based browsers.
Ituitive as the feature is that Mozilla browsers have had “View Selected Source” since the days of the caveman, oddly Copy Cat sometimes is more accurate for probably what you’re going for (and sometimes not at all). Play with it.

The GitHub repo (link above) has separate links to the browser-specific pages. I like this because I rarely would want to “copy” and entire page of code. I generally just want to copy a paragraph or two, with maybe a few lines of code from an example.

Copy HTML Text WE – Select areas of a page and copy the HTML for that selection. Much like CopyCat, but tends to function correctly on more pages.
Get Copy HTML Text WE

Download All Sources

For Mozilla browsers. This extension makes it easy to download the following:
Link URL
URLs included in selected range
Specified URLs
All URLs in the page
Filter URLs by filetype/ keyword
Dynamic naming
Remember custom filters/ parameters

Fire Source View

for quickly viewing HTML, JavaScript and CSS. Features Incl:

• Source code with syntax highlighter
• JavaScript node counts.
• Line numbers, file size and cache header displayed.
• Copy source code to clipboard.

Get Fire Source View – Similar, by the way, to the View Rendered/ Current Source extensions for Chrome listed here.

List Sources

Easily see all the page dependencies (this i think is the wrong one. this is the images only one, i think.). damnit. Useful if trying to figure out where certain scripts [not this one for scripts / css. fix this, Geoffrey!] or files are coming from, or if you need to grab a resource the source of which isn’t easily discovered. There’s a Mozilla version and a Chrome version available.

Markdown

Render Markdown Github-style in Chrome

Render Markdown in a Mozilla browser

Save All Resources

For Chrome – Easily save the current site’s resources like images a scripts. (Downloads a .zip archive which may include fonts, etc.)

Simple Mass Download

For Chrome – Convenient filter by file (e.g. *.css).

View Rendered Source

View Rendered Source (Chrome only at time of writing)
“shows you how the browser has constructed (rendered) a page’s original HTML into a functioning DOM, including modifications made by JavaScript. An essential tool for web developers using JavaScript frameworks like Angular, ReactJS and Vue.js, and for SEOs to understand how search engines see your pages, especially considering Google’s dynamic serving workaround.”

Oddly, View Rendered Source almost works in Waterfox. I don[‘t understand why, but that would be an interesting project: Convert VRS into a working extension for Mozilla browsers!

View Current Source

View Current Source (Chrome only at time of writing)
“source code of a page as it is right when you right-click and select “view current source” in your context menu. It is especially helpful when you develop a dynamic webpage with a lot of JavaScript involved in building it..”

View Source Chart – Bookmarklet

By Jennifer Madden

Collapsible / Editable HTML Rendered Source View:

[View Source Chart] should be standard in every web developer’s toolkit.

-John Resig, creator of jQuery

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CSS / Design

Font Finder (revived)

Font Finder is available for both Chrome and Mozilla.

So far, it’s my favorite of the “font-finder” browser extensions. Featuring mouse-over function and the full CSS declaration information (click the thumbnail for full size image)! I’d say that’s better than the deal you get in a Happy Meal.

Snip CSS

“extracts all CSS styles associated with any portion of a webpage. It works on all websites, and after a few clicks you get the CSS, HTML and Images associated with the section of the website you are trying to recreate.”
Get Snip CSS

VisBug: CSS/ Design/ Layout – Inspect/ Edit

VisBug for Mozilla
VisBug for Chrome

Web Design Pirate

Adds new tab to the browser native Dev Tools. Web Design Pirate assists with inspecting code on the page.

What Font Is

There are definitely more than enough “font finder” extensions. The two listed here are a little different than a lot of the others at least (as most of the others seem to be the same one!).
WhatFontIs is actually a site for identifying what font is shown in an image. A browser extension is currently available in the Google Chrome Store for Chrome-based browsers for the WhatFontIs.com functionality. It’s also available for Mozilla browsers, but it didn’t work at time of writing this. It seems to make sense to use that extension if you want to identify fonts in a webpage, as it will also process images containing typography directly from the web page. Also check out WhatFontIs.com

WordPress Theme

WordPress Theme Detection for Mozilla
WordPress Theme (and plugin) detection for Chrome

Z-Index

For Mozilla and for Chrome
Easily identify where any HTML elements might be overlapping, etc.

Privacy and Security

uBlock Origin

“a wide-spectrum content blocker for Chromium and Firefox with CPU and memory efficiency as primary features. After a new installation, the default behavior of uBO is to block ads, trackers, and malware” ~ gorhill
Get uBlock Origin at GitHub for Chrome or Mozilla.

pResearch

“The Presearch Engine is a next-generation search engine built to provide the world with a decentralized alternative that operates more like a public utility on behalf of its community rather than shareholders.”
Get the Presearch decentralized Search engine extension.

Productivity

Interact, Record, Track, Plan

Click-up: Seamless Browser extension to enhance Click-up.

• 1. Create Tasks & Save Websites as Tasks
• 2. Time Tracking: Easily attach time to ClickUp tasks
• 3. Screenshots: Capture, mark up, and edit screenshots
• 4. Email: Create tasks and attach emails to tasks
• 5. Notepad

ClickUp is free forever (up to 100MB of files storage)

Diigo

“Diigo is a powerful research tool and a knowledge-sharing community” – Create your account, and install the Diijo extension

Document How-to Guides (Create)

Tango – “Each click auto-generates a step with text and visuals as you go, creating a beautiful, shareable, interactive walkthrough called a Tango. Share your Tango with just a click, anywhere you store and share knowledge: 🔗 Share a direct link via email or chat 🌐 Live Embed in your knowledge base or public web pages 🌟 Or best of all, let Tango be the guide—with step-by-step guidance right on the screen, plus context and insights right where they’re needed Tango is free to use.” Update, 08/2023: Tango has a special offer that might interest you!

Eliminate

Prevent Duplicate Tabs for Mozilla or Chrome (recommended).

Clutter Free Chrome. Runs in the background, checking when tabs are opened or links are clicked to see whether the target webpage is already open. (Pay attention though if you try this. I think it might mess with the way the seach results function if you tend to open results in a new tab. might not be this extension though. might require some tweaking)

Remember

Sticky Notes: I know. I know. There’s 1,001 sticky note apps. This I like because it allows me to simply add a brief jot to a page i might have in the background, so I don’t forget what I was doing there. It doesn’t seem to be the type where I’m going to stick a bunch of notes all over the screen to defeat the purpose of notes. Mozilla users, this is the one you want for that purpose. It’s super simple. Wish it was available for Chrome.

Sticky Notes “Free”

for taking quick notes inside your browser with a single click. Unique 3 notes layout will give you quickest access to multiple notes. It is a simple & easy note taking experience for Chrome. ** DO NOT uninstall or reinstall the app without taking the backup of your notes. Your app data gets reset once you uninstall. **

Note Board (deluxe)

More than just sticky notes. More like the Opera Pinboards. Check out the extension for Chrome

RSS / Syndication / Aggregation

RSS Aggregator – Like what you remember from old Opera

Search Something

Bong because Bing

“Redirect all Bing (and therefore Cortana) searches to a search engine of your choice!”

Get Bong for Mozilla

Get Bong for Chrome

Bing to Duck Duck Go

Redirect Bing to Duck Duck Go for Mozilla

Sidebar

Mozilla Sidebars

Various sidebars for Mozilla-based browsers/ Firefox/ Waterfox/ LibreWolf etc

Tree Style Tab is also useful!

Chrome Sidebars

Various Sidebars for Chromium-based browsers/ Google Chrome/ MS Edge/ Brave etc

tabVertical – Vertical Tabs Sidebar for Chrome

SEO / SEM

aHREFs

AHREFS (Chrome Version) is The leading alternative SEO Data Science Analytics resource. Get the browser extension.
aHREFs (Firefox Version)

The Presearch Engine is a next-generation search engine built to provide the world with a decentralized alternative that operates more like a public utility on behalf of its community rather than shareholders.

pResearch

“The Presearch Engine is a next-generation search engine built to provide the world with a decentralized alternative that operates more like a public utility on behalf of its community rather than shareholders.”
Get the Presearch decentralized Search engine extension.

SEOquake

Get SEOQuake! Google index, Google cachedate, Yahoo index, Semrush backlinks, Semrush backlinks by domain, Semrush backlinks by hostname, Bing index, Facebook likes, Semrush Rank, Semrush SE Traffic, Semrush SE Traffic price, Semrush, Baidu index

SEOQuake for Mozilla

SEO Meta 1 Copy

SEO Meta 1 Copy is available for Chrome and Firefox. Why Confuse things?

Tabs / New-tab / “Start Page”

See also: Too Many Tabs under Productivity

Humble New Tab

Select from a nicely arranged display of your bookmarks when you open a new tab. No bloat. Just bookmarks, the way God intended.

Momentum Dash

Consider Momentum Dash as your new tab replacement for Manganum (which is no longer a free to use extension). Get used to it. It works nicely! A paid version is also available, but not required.

Manganum – New Tab

Your new-tab page on ecstasy. The Manganum app website. Sadly, I don’t think it works for Opera. If you find it does, please let me know. I suppose the Opera Speed Dial is good enough, but this thing is pretty cool and you should check it out.

pResearch

pResearch Add the new Decentralized Search Engine
pResearch New Tab page

Start.me

Start.me – FREE Version (the default start-page of the geek curmudgeons of the PaleMoon browser community, FWIW), there is a “Pro” version as well. This is probably the best one of the 3rd-party “start page”, or “new tab” page type of plugins. You’ll maintain a synced account, so it won’t matter where or when you are, so long as you can remember your password, or associated account (e.g. sign in and config with Google Oauth2). Chrome users, be sure to get the official extension! Mozilla users will need to install New Tab Override or something similar to start.me can act as a Home page, and New Tab page. If you don’t want it to be your new-tab page, you don’t have to install anything!

Start.me allows for multiple customized “pages”. Why bother with another “new tab” plugin, if you can set one to give you what you need, and no constant nagging to upgrade to “Pro”? It will import your bookmarks (though probably not a necessary feature now that browsers can sync their own setups). Check it out though. I’m personally going to try to get accustomed to using it primarily. Although, I do like the simplicity of Humble New Tab (see above).

Vertical Tabs

• tabVertical – Vertical Tabs Sidebar for Chrome

Web Development General

Accessibilty

Axe DevTools Web Accessibility Testing

powerful testing tool driven by the world’s most trusted accessibility testing engine, axe-core, developed by Deque.

Deque.com

HTTP Headers

HTTP Header Spy – Request headers plus XHR – for Mozilla
HTTP Header Spy for Chrome

Identify Development Stack in Use on Web Site Viewed

Wappalizer is a cool tool. There are others like it, but this was the first one I discovered, and it is likely the best at this time. They maintain a website where you can create an account and benefit from even more service features for a small fee. The extension itself is free. For Chrome or Firefox.

BuiltWith Tech Profiler
Find out what the website you are visiting is built with using this extension.
The BuiltWith Chrome Extension lets you find out what a website is built with by a simple click on the builtwith icon! BuiltWith is a web site profiler tool. Upon looking up a page, BuiltWith returns all the technologies it can find on the page.

PHP Clockwork

Clockwork is a PHP package that can be installed using Composer. There’s an accompanying browser extension available for further enhancement.

PHP Xdebug

Having difficulty getting Xdebug step debugging to cooperate with your Development Environment? Try the Xdebug Helper for Chrome or Firefox.

Translate (Human Language)

Probably don’t even need to put this here, but just in case:
Translate page content for Mozilla browsers
Translate content for Chrome browsers

Validate!

HTML Validator: – The old HTML Validator is back! Open Developer Tools in Firefox or Chrome and look for the HTML Validator panel after installing the extension.

Validity: Only available for Chrome at time of writing. Receives great reviews!

Web Developer Toolbar

(aka. Web Developer by Chris Pederick) I wonder what ever happened to good ol’ Chris Pederick. No matter. I also wonder what ever happened to that jerk-faced kid who sat in front of me in 9th grade.

Most of the Addons available at addons.mozilla.com don’t work with Seamonkey, Basilisk, or PaleMoon. I’m sure there’s an easily understood reason why, but I must remark I never had the initiative to figure out exactly what is the different. Odd considering I used to be a big Seamonkey fan. I do know that these three will at least try to install the old style Firefox addon format .xpi or .jar (for themes).

I haven’t noticed any issues with having all of those listed here installed and enabled at once. In fact, I most likely have many others enabled as well. I don’t notice much effect on performance, unlike the older days when it was advantageous to have as few extensions installed as possible so the browser wasn’t sluggish. I suppose it remains advantageous to an extent.

Wedge

What is Wedge? Wedge is a project that aims to free you from Microsoft Edge

To be honest with you, since I’ve made this page I come here to reference these links to addons a lot. I’m ashamed to say I probably will now be in the habit of installing all them all for whatever browser I might be using. I truly must force myself to be minimal when it comes to stuff like that (checking all of the boxes, or unchecking them all, or all of something!).