Firefox add-on with keyword - source
Add-ons (also known as extensions) are small programs that run inside web browsers like Mozilla Firefox. They add extra features to the browser without having to download anything new. You can use extensions to make browsing faster, easier, and safer. Some extensions even let you do things like translate text on websites, search the web, and play games.
There are over 28,000 Firefox-addons and 480,000 themes, making it hard to find the best ones. so we have created a way to sort through all of them. Use the dropdown above to set different filters. Add-ons are sorted by number of active users.
To set even more advanced filters, and sort the Firefox add-ons differently, please visit our Advanced search tool. Note that Advanced search tool is only available to premium members.
![View Source](https://addons.mozilla.org/user-media/addon_icons/61/61772-64.png?modified=1508023221)
#1, View Source
![View Source](https://addons.mozilla.org/user-media/addon_icons/61/61772-64.png?modified=1508023221)
![View Page Source](https://addons.mozilla.org/user-media/addon_icons/2298/2298992-64.png?modified=7ae6eede)
#2, View Page Source
![View Page Source](https://addons.mozilla.org/user-media/addon_icons/2298/2298992-64.png?modified=7ae6eede)
![Passbolt - Open source password manager for teams](https://addons.mozilla.org/user-media/addon_icons/687/687753-64.png?modified=15ac2013)
#3, Passbolt - Open source password manager for teams
![Passbolt - Open source password manager for teams](https://addons.mozilla.org/user-media/addon_icons/687/687753-64.png?modified=15ac2013)
![Extension source viewer](https://addons.mozilla.org/user-media/addon_icons/717/717783-64.png?modified=1693259020)
#4, Extension source viewer
![Extension source viewer](https://addons.mozilla.org/user-media/addon_icons/717/717783-64.png?modified=1693259020)
![View Page Source (Mobile)](https://addons.mozilla.org/user-media/addon_icons/896/896093-64.png?modified=1512423413)
#5, View Page Source (Mobile)
![View Page Source (Mobile)](https://addons.mozilla.org/user-media/addon_icons/896/896093-64.png?modified=1512423413)
![SimpleLogin: Open-source Email Protection](https://addons.mozilla.org/user-media/addon_icons/2612/2612998-64.png?modified=a73701bb)
#6, SimpleLogin: Open-source Email Protection
![SimpleLogin: Open-source Email Protection](https://addons.mozilla.org/user-media/addon_icons/2612/2612998-64.png?modified=a73701bb)
![Fire Source Viewer](https://addons.mozilla.org/user-media/addon_icons/1482/1482049-64.png?modified=a42a2977)
#7, Fire Source Viewer
![Fire Source Viewer](https://addons.mozilla.org/user-media/addon_icons/1482/1482049-64.png?modified=a42a2977)
![Feedbro](https://addons.mozilla.org/user-media/addon_icons/829/829001-64.png?modified=1701807732)
#8, Feedbro
![Feedbro](https://addons.mozilla.org/user-media/addon_icons/829/829001-64.png?modified=1701807732)
![Download All Sources](https://addons.mozilla.org/user-media/addon_icons/1183/1183246-64.png?modified=aa03ac6e)
#9, Download All Sources
![Download All Sources](https://addons.mozilla.org/user-media/addon_icons/1183/1183246-64.png?modified=aa03ac6e)
![SimilarWeb - Website Traffic Sources and Ranking](https://addons.mozilla.org/user-media/addon_icons/10/10548-64.png?modified=1605100909)
#10, SimilarWeb - Website Traffic Sources and Ranking
![SimilarWeb - Website Traffic Sources and Ranking](https://addons.mozilla.org/user-media/addon_icons/10/10548-64.png?modified=1605100909)
![ActivityWatch - Open Source Time Tracker](https://addons.mozilla.org/user-media/addon_icons/860/860977-64.png?modified=1668590839)
#11, ActivityWatch - Open Source Time Tracker
![ActivityWatch - Open Source Time Tracker](https://addons.mozilla.org/user-media/addon_icons/860/860977-64.png?modified=1668590839)
![View Page Source Button](https://addons.mozilla.org/user-media/addon_icons/643/643966-64.png?modified=1530069626)
#12, View Page Source Button
![View Page Source Button](https://addons.mozilla.org/user-media/addon_icons/643/643966-64.png?modified=1530069626)
![Source Code](https://addons.mozilla.org/user-media/addon_icons/2614/2614227-64.png?modified=2c098a30)
#13, Source Code
![Source Code](https://addons.mozilla.org/user-media/addon_icons/2614/2614227-64.png?modified=2c098a30)
![List Sources](https://addons.mozilla.org/user-media/addon_icons/903/903402-64.png?modified=1513189223)
#14, List Sources
![List Sources](https://addons.mozilla.org/user-media/addon_icons/903/903402-64.png?modified=1513189223)
![View Link Source](https://addons.mozilla.org/static-server/img/addon-icons/default-64.d144b50f2bb8.png)
#15, View Link Source
![View Link Source](https://addons.mozilla.org/static-server/img/addon-icons/default-64.d144b50f2bb8.png)
![MathML View Source](https://addons.mozilla.org/user-media/addon_icons/702/702928-64.png?modified=1672124455)
#16, MathML View Source
![MathML View Source](https://addons.mozilla.org/user-media/addon_icons/702/702928-64.png?modified=1672124455)
![Return Tweet Source Label & Bird icon](https://addons.mozilla.org/user-media/addon_icons/2778/2778969-64.png?modified=023578a2)
#17, Return Tweet Source Label & Bird icon
![Return Tweet Source Label & Bird icon](https://addons.mozilla.org/user-media/addon_icons/2778/2778969-64.png?modified=023578a2)
![View Page Source](https://addons.mozilla.org/static-server/img/addon-icons/default-64.d144b50f2bb8.png)
#18, View Page Source
![View Page Source](https://addons.mozilla.org/static-server/img/addon-icons/default-64.d144b50f2bb8.png)
![FoxyProxy Standard](https://addons.mozilla.org/user-media/addon_icons/2/2464-64.png?modified=1f409a60)
#19, FoxyProxy Standard
![FoxyProxy Standard](https://addons.mozilla.org/user-media/addon_icons/2/2464-64.png?modified=1f409a60)
![WikiTree Sourcer](https://addons.mozilla.org/user-media/addon_icons/2715/2715446-64.png?modified=532c0abf)
#20, WikiTree Sourcer
![WikiTree Sourcer](https://addons.mozilla.org/user-media/addon_icons/2715/2715446-64.png?modified=532c0abf)
![Resource Override](https://addons.mozilla.org/user-media/addon_icons/2622/2622669-64.png?modified=f9e60f74)
#21, Resource Override
![Resource Override](https://addons.mozilla.org/user-media/addon_icons/2622/2622669-64.png?modified=f9e60f74)
![View Source Switch](https://addons.mozilla.org/user-media/addon_icons/2672/2672882-64.png?modified=4bfcb2db)
#22, View Source Switch
![View Source Switch](https://addons.mozilla.org/user-media/addon_icons/2672/2672882-64.png?modified=4bfcb2db)
![Sources de confiance](https://addons.mozilla.org/user-media/addon_icons/2634/2634562-64.png?modified=b1d9eeb0)
#23, Sources de confiance
![Sources de confiance](https://addons.mozilla.org/user-media/addon_icons/2634/2634562-64.png?modified=b1d9eeb0)
![Sourcegraph for Firefox](https://addons.mozilla.org/user-media/addon_icons/1010/1010429-64.png?modified=d179f29e)
#24, Sourcegraph for Firefox
![Sourcegraph for Firefox](https://addons.mozilla.org/user-media/addon_icons/1010/1010429-64.png?modified=d179f29e)
![Reddit source image viewer](https://addons.mozilla.org/static-server/img/addon-icons/default-64.d144b50f2bb8.png)
#25, Reddit source image viewer
![Reddit source image viewer](https://addons.mozilla.org/static-server/img/addon-icons/default-64.d144b50f2bb8.png)