An easy-to-use font inspector to get CSS styles of the selected element
Evaluate web accessibility within the Firefox browser. When activated, the WAVE extension injects icons and indicators into your page to give feedback about accessibility and to facilitate manual evaluation.
window.crypto.signText replacement plus enhancements
A free extension of the web tool https://coolsymbol.com/emojis/emoji-for-copy-and-paste.html. It helps input emoji in the web browser with an extensive search functionality.
RusVPN - Free VPN Proxy service
The Ultimate online investigation tool! See detailed information about every IP Address, Domain Name and Provider.
Fast JSON viewer - highlights, shows items count/size, handles large files
This extension allows you quickly to set the X-Forwarded-For HTTP Header
Form autofill on steroids.
Displays the HTTP header. Edit it and send it.
Clone and open projects from GitHub, GitLab, and Bitbucket in JetBrains IDEs right from your browser
Manage your Polkadot accounts outside of dapps. Injects the accounts and allows signs transactions for a specific account.
Add and modify the HTTP request headers and response headers. ** Features ** - Add / modify / remove request headers and response headers - Multi-profile support - Filtering based on URL - Export, import, cloud backup
A simple eye-dropper & color-picker tool allowing you to select color values from webpages. You will need to enable the add-on bar Firefox menu->Options->Add-on Bar OR View->Toolbars->Add-on Bar Then refresh the page.
manage, edit, manipulate, plot and save one or multiple SQLite databases simultaneously
Allows all sites to be loaded in iframes, despite X-Frame-Options header settings.
HTML Validator is a Mozilla extension that adds HTML validation inside Firefox, Mozilla. The number of errors of a HTML page is seen on the form of an icon For Firefox 56, use 0.974 (see all versions below). For Firefox 57, see Web Extensions.
Easily add (Access-Control-Allow-Origin: *) rule to the response header.
ICPBravo Access ICPBrasil and General PKI Extension.
Add, modify or remove a header for any request on desired domains.
A REST client for almost any web service.
A HackBar for new firefox (Firefox Quantum). This addon is written in webextension and alternatives to the XUL version of original Hackbar. Press F12 to use HackBar
GitHub on steroids
A Firefox/Chrome extension to modify HTTP requests :-)