Add repositories size to their GitHub summary band using the GitHub public API.

Highlight multiple words separated by comma, space or arbitrary separator with regular expression support

Display JSON objects by transforming them into Syntax editable highlighted HTML

Detect which CMS a site is using with the help of WhatCMS.org

Profile your PHP application from your browser

RDS Bar is a handy tool for quick analysis of website and page SEO indicators, designed for webmasters and optimizers. And also with a number of useful features for ordinary users.

Display up-to-date list of public OpenVPN servers provided by VPN Gate (University of Tsukuba)

Displays anchors for all content in the current web page without breaking the layout.

Blocks websites from using javascript to port scan your computer/network and dynamically blocks all LexisNexis endpoints from running their invasive data collection scripts.

Shows approximately what users will see if this webpage is shared on websites that uses OG tags to display a preview.
Let you detect if no Open Graph Tags are set on your webpage !
The shown preview is inspired from the Facebook one.

Easily browse, edit and manage SQLite database inside your browser!

Open PageSpeed Insights to analyze the web page on the current opened tab.

Copy/Paste all fields from a web form (with hotkey or contextual menus)

This extension is used by developers to make it easy to save and fill forms for use in submission testing and validation.

Button to refresh the current page without using the cache.

- Apply any CSS rules for any websites, including iframes.
- Whitelist and Blacklist functionality
- Apply CSS rules to specific URLs, Domains or Globally
- Syntax highlighting & line numbers
- Update without page refresh

This add-on renders standalone images on a transparent background, so you can see the image in all its glory!

Enables the resolving of Dot-BIT domains by Namecoin. Also .emc, .coin, .lib and .bazar domains by EmerCoin.

Addon for web devs. Monitor included JS, CSS and/or HTML in frames and automatically reload the host page when a change is detected in the included source. Supports inline reloading of stylesheets and frames without reloading the host page.

Ad Skipper is gives you less interrupted online streaming and skip or removes ad on behalf of you. It does not block an ads and auto skip or remove ads on MxPlayer, SonyLiv & Youtube web platform.

View exIF allows you to view metadata contained in .jpg and .tiff images from your Firefox browser.

Generates a Lighthouse Report without needing to use Chrome or the Lighthouse CLI

Pretty-prints JSON content in the browser for easy, unobtrusive viewing.

An Extension for Firefox to easily change the language and locale.

Show the Bootstrap grid class currently active (XS, SM, MD, LG, XL, XXL).

Tested and work with the versions: 3, 4, 5

Not compatible versions:
4 Alpha 2

Parses and displays messages from X-ChromeLogger-Data and X-ChromePHP-Data headers in DevTools Web Console facilitating server-side debugging via the Chrome Logger protocol ( https://craig.is/writing/chrome-logger/ ).

It turns language-specific module-loading statements like include, require or import into links. Depending on the language it will either redirect you to the referenced file or to an external website like a manual page or another service.

An extension for controlling requests.

Lets you Bypass Quora Login.
A Quora Blog shared this trick/hack so that knowledge can be shared without restriction. If you are logged in, it won't do anything.
But say you are not logged in (or using private window), then this comes handy.

This extension lets you insert Lorem Ipsum anywhere on your page with an edit mode to modify any content on your page.