• Adblock µBlock uBlock Origin : should I have to explain?
• ColorfulTabs : nice colors in your tabs
• Firebidule : rename your browser with a random name. Totally useless, so a must have
• Fission : address bar and progress bar, like Safari
• Flagfox : Displays a country flag depicting the location of the current website's server and provides quick access to detailed location and webserver information
• Flashblock : Disable/Enable automatic flash content display, which can activated on-demand
• Forecastfox : Get international weather forecasts from AccuWeather.com, and display it in any toolbar or statusbar with this highly customizable and unobtrusive…
• Foxmarks Bookmark Synchronizer : Share bookmarks between computers, and on The web
• GSpace : use your Gmail account to store files, using a FTP-like interface.
• Greasemonkey : Allows you to customize the way a webpage displays using small bits of JavaScript (see below for the scripts I use)
• It's All Text! : Edit forms using your favorite editor. here is a tip to use it with vim.
• Neo Diggler : add a “clear url bar” button, along with some nice shortcuts, similar to Konquefox, but Firefox 6-compatible
• mediaplayerconnectivity : allow you to launch embed video of website in an external application
• MR Tech Disable XPI Install Delay : disables default delay when installing extensions
• Tab Preview : shows a preview of tab contents
• Hide Menubar : just as the name suggests, press <alt> key to show it again
• User-Agent Switcher : adds a menu and a toolbar button to switch the user agent of the browser
• Page Speed : some optimization help (requires Firebug)
• Screengrab : do a screenshot of the whole webpage (not only the visible part)
• Skip Cert Error (formerly MitM Me) : disable the certificate warning when visiting a https website for the first time
• Skip Feedsportal : because we don't need no ads in RSS feeds
• Start Google Plus : let you mix Facebook & Twitter feeds with your Google+ one, and cross-post on the free networks. can also add a gmail notifier in the Google bar
• Add-on Compatibility Reporter : avoid break of add-ons after each major Firefox update; plus, let you report what add-ons still works after update
• Long URL Please : short URL sucks, here's a way to get back the long ones
• Ghostery (and Collusion) : because privacy matters
• Searchonymous : “Search anonymously on Google, while keeping your search preferences and stay logged in on services such as Youtube, Gmail, etc.”
• The Addon Bar (Restored) New Add-on Bar : Gives you a place to put all your add-on buttons without over-crowding the navigation bar (a.k.a. “I use Firefox, and I don't want it to look like Chrome”)
• about:addons-memory : Adds an about:addons-memory page that details add-on memory usage
• Wappalyzer : Tells you what software is used on the current visited website
• RequestPolicy Continued : Protect from ligatus/outbrain/etc. crap
• Certificate Patrol : check for recently changed certificates
• Video Blocker (Chrome) : remove channels from video suggestions
• AutoAuth : Automatically submits HTTP authentication dialogs when you’ve chosen to have the browser save your login information
• Shaarli : add a Shaarli button to bookmark delicious links
• Toggle animated GIFs : because the shortest GIFs are the better ones :)
• Two Factor Authenticator : Generates TOTPs for 2 factor authentication (Google Authenticator style)
• Make Google Images Great Again : restore the “View image” button

• Google's Old Favicon : because the new one sucks
• Google+ Old Favicon : same thing, but for g+
• HQTube : automatically selects the HQ version of a Youtube clip
• Check Range : allows to check multiple check-boxes at a time, using shift+left click
• FreeMobile : restore legacy login form on Free Mobile's website
• Disable Youtube Autoplay: because I don't want a fucking jukebox
• Disable Youtube next video autoplay: same as above, but for next video (unfortunatly the first one does not seem to work for that)
• YT - Overlay remover: hide cards/overlays on youtube videos not working (anymore), use “www.youtube.com##.ytp-ce-element” in uBlock instead
• YouTube: Age Verification Bypass: yeah, I'm old enough and I do not want to login
• The Ultimate Popup Blocker: hope it will block all these JS silly popups…
• Pinterest without registration: allows to browse Pinterest without login/registration, removing the offending modal popup (see below for Facebook)
• Facebook and Instagram login popup remover: same as Pinterest but for Facebook & Instagram, obviously.
• Instagram Download Button: add the download button and the open button to download or open profile picture and media in the posts, stories, and highlights in Instagram

For Facebook:

• replace smileys : Replace text smileys with graphic ones
• Facebook Fixer : a.k.a Facebook-on-steroids
• Chat Killer : web is not for IM. Get a real client, and use Jabber.
• Friends Checker : Regularly checks your Facebook friends to check whether anyone has removed you from their friends.
• Nickbook : personal script to hide avatar below the comment box

• Manually sort folders : sort account folders
• Firetray : display number of unread messages in the tray bar
• Lightning : Calendar for Thunderbird
• Provider for Google Calendar : sync Google Calendar with Lightning
• Exchange 2007/2010 Calendar and Tasks Provider : the perfect companion of Lightning, for those living and working under MS Exchange oppression.
• Google Contacts : adds Google Contacts address book
• Mailbox Alert : customizable notifications
• Smiley Fixer : “Fixes Wingding Smileys in Outlook-generated emails”
• SOGo Connector : easy way to do [Cal|Card]dav in Thunderbird