Web and Developer Tools
The Web Developer extension adds various web developer tools to the browser.
NoScript Security Suite Featured
The best security you can get in a web browser!
Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.
Remote XUL Manager No Restart
Manages the Remote XUL whitelist to allow websites and local files to load XUL content. For versions compatible with Firefox 41 and lower, see All Versions page below.
Click-to-Play Manager No Restart
Manages the Click-to-Play domain whitelist.
Flagfox No Restart
Displays a country flag depicting the location of the current website's server and provides a multitude of tools such as site safety checks, whois, translation, similar sites, validation, URL shortening, and more...
Live HTTP Headers (clone) No Restart
View HTTP headers of a page and while browsing.
This is an unofficial "Live HTTP headers" clone, mainly to fix the Replay feature!
Screengrab! saves webpages as images.
New features: upload to internet
Open links, pages, and bookmarks in any other browser or media player. Modify any menu, browser name or location. Incognito/private browsing mode is also supported. Works for all Firefox locales/languages.
Element Inspector No Restart
In the DOM Inspector,quickly navigate to the any elements
Classic Toolbar Buttons No Restart
'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions on Windows.
Beta builds on versions page!
RequestPolicy Continued No Restart
Be in control of which cross-site requests are allowed. Improve the privacy of your browsing by not letting other sites know your browsing habits. Secure yourself from Cross-Site Request Forgery (CSRF) and other attacks.
Open With Photoshop No Restart
Open With Photoshop is a new companion for web and graphic designers to open up any web image with Adobe Photoshop via a single and quick mouse click.
Quickly test out your web pages in Internet Explorer, Chrome, Safari, or Opera. Open With opens the current page in your other browsers with just one click. Add Open With to your menus, toolbars and developer toolbox today!
Add-ons Manager - Version Number No Restart
Restores version numbers for all installed add-ons inside Add-on Manager on Firefox, Thunderbird and Seamonkey.
FontFinder is created for designers, developers and typographers. It allows a user to analyze the font information of any element on a page, copy any piece(s) of that information to the clipboard, and perform inline replacements to test new layouts.
FireShot makes full web page screenshots. Demo: http://bit.ly/RlBQMV
Screenshots can be quickly captured and:
― Saved as Image or PDF
― Sent to clipboard
― Annotated *
― Uploaded *
― E-Mailed *
* OS Windows only
This add-on is not compatible with your version of SeaMonkey because of the following:
- Add-on has opted into strict compatibility checking.
Element Hiding Helper for Adblock Plus No Restart
Fight the text ads! Element Hiding Helper is a companion extension for Adblock Plus meant to make creating element hiding rules easier.
Modify HTTP Response No Restart
Rewrite http response body using search & replace patterns
about:addons-memory 2016 No Restart
Adds a new page that shows add-on memory usage