Don't "Accept" image/webp
This extension removes image/webp and/or image/avif from the list of formats Firefox tells sites that it accepts. That discourages many servers from replacing JPEG and PNG images with WebP/AVIF. (But some may send them anyway; they aren't blocked.)
23,570 users
Passbolt - Open source password manager for teams
Passbolt is an open source password manager designed for collaboration. Securely create, manage and monitor your passwords. Share them instantly with your team.
23,500 users
Notes by Firefox
Displays a sidebar that lets you take notes on web pages.
23,354 users
SellerSprite - The Most Professional Amazon Tool
An integrating software that helps Amazon sellers find products, optimize keywords, do keyword&product research, spy on competitors, etc.
23,204 users
23,203 users
BNB Chain Wallet
A Crypto Wallet for BNB Smart Chain, BNB Beacon Chain and Ethereum.
23,151 users
Map Route Pro and Search
Map Route Pro provides free maps and directions via the favicon on the toolbar along with web search results powered by Yahoo®
23,071 users
Colorpick Eyedropper
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.
23,043 users
European Portuguese Spellchecker
European Portuguese (pt-PT) Dictionary
22,982 users
Avira Password Manager
Avira Password Manager saves, manages, and syncs all your passwords across all your devices.
22,833 users
22,810 users
ImageAssistant Batch Image Downloader
An image extractor for sniffing, analyzing and batch downloading images from web page.
22,501 users
Todoist for Firefox
Organize work and life with Todoist for Firefox
22,435 users
10ten Japanese Reader (Rikaichamp)
Quickly translate Japanese by hovering over words. Formerly released as Rikaichamp.
22,331 users
German dictionary (de_DE)
German dictionary igerman98 (de_DE, Germany), for Firefox, Thunderbird und Seamonkey.
22,231 users
Repeek (formerly FACEIT Enhancer)
Repeek enhances your experience on FACEIT and adds useful features
22,182 users
YouTube mp3 Downloader
The YouTube mp3 Downloader Add-on includes a Button on any YouTube Page and allows you to convert the YouTube Video to a mp3 with just one click. Compatible with new FireFox Quantum 57+
22,170 users
Swedish Dictionary
Swedish spell-check dictionary.
22,088 users
Save Page WE
Save a complete web page (as currently displayed) as a single HTML file that can be opened in any browser. Save a single page, multiple selected pages or a list of page URLs. Automate saving from command line.
22,033 users
Raindrop.io
All-in-one bookmark manager
21,913 users
Video Downloader Prime
Easily download most popular video formats.
21,911 users
WEB.DE MailCheck for Firefox
Mail notifier for multiple email accounts
21,693 users
Font Finder (revived)
An easy-to-use font inspector to get CSS styles of the selected element
21,611 users
Antidote Connector for Firefox
Use Antidote directly where you are writing! Run a text through the corrector and the changes you make will automatically be applied to the original text in Firefox. (You must have access to Antidote.)
21,541 users
uMatrix
Point & click to forbid/allow any class of requests made by your browser. Use it to block scripts, iframes, ads, facebook, etc.
21,529 users