Firefox add-on with keyword - class
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.
#1, Glass - Royale
![Add Last Active Class To Tab](https://addons.mozilla.org/static-server/img/addon-icons/default-64.d144b50f2bb8.png)
#2, Add Last Active Class To Tab
![Add Last Active Class To Tab](https://addons.mozilla.org/static-server/img/addon-icons/default-64.d144b50f2bb8.png)
![GOG 2nd Class Helper](https://addons.mozilla.org/user-media/addon_icons/2729/2729923-64.png?modified=c974870f)
#3, GOG 2nd Class Helper
![GOG 2nd Class Helper](https://addons.mozilla.org/user-media/addon_icons/2729/2729923-64.png?modified=c974870f)
#4, Classic Blue
#5, Black Leather Class
![ClassGerman](https://addons.mozilla.org/user-media/addon_icons/6/6866-64.png?modified=1510986023)
#6, ClassGerman
![ClassGerman](https://addons.mozilla.org/user-media/addon_icons/6/6866-64.png?modified=1510986023)
![NoScript Security Suite](https://addons.mozilla.org/user-media/addon_icons/0/722-64.png?modified=238235f7)
#7, NoScript Security Suite
![NoScript Security Suite](https://addons.mozilla.org/user-media/addon_icons/0/722-64.png?modified=238235f7)
![LastPass Password Manager](https://addons.mozilla.org/user-media/addon_icons/8/8542-64.png?modified=mcrushed)
#8, LastPass Password Manager
![LastPass Password Manager](https://addons.mozilla.org/user-media/addon_icons/8/8542-64.png?modified=mcrushed)
#9, A Firefox Classic - FF 4.0
![Bitwarden Password Manager](https://addons.mozilla.org/user-media/addon_icons/735/735894-64.png?modified=27707d93)
#10, Bitwarden Password Manager
![Bitwarden Password Manager](https://addons.mozilla.org/user-media/addon_icons/735/735894-64.png?modified=27707d93)
#11, ClassicWindows
#12, Classic Red
![Gopher Grades - Past grades for UMN classes!](https://addons.mozilla.org/user-media/addon_icons/2789/2789515-64.png?modified=18a229ee)
#13, Gopher Grades - Past grades for UMN classes!
![Gopher Grades - Past grades for UMN classes!](https://addons.mozilla.org/user-media/addon_icons/2789/2789515-64.png?modified=18a229ee)
![Wood class](https://addons.mozilla.org/user-media/version-previews/full/1687/1687337.png?modified=1616434600)
#14, Wood class
![Wood class](https://addons.mozilla.org/user-media/version-previews/full/1687/1687337.png?modified=1616434600)
#15, Classic System Theme
#16, Classic Black
![SSC Classic](https://addons.mozilla.org/static-server/img/addon-icons/default-64.d144b50f2bb8.png)
#17, SSC Classic
![SSC Classic](https://addons.mozilla.org/static-server/img/addon-icons/default-64.d144b50f2bb8.png)
![Class Link Check for Google Classroom™](https://addons.mozilla.org/static-server/img/addon-icons/default-64.d144b50f2bb8.png)
#18, Class Link Check for Google Classroom™
![Class Link Check for Google Classroom™](https://addons.mozilla.org/static-server/img/addon-icons/default-64.d144b50f2bb8.png)
#19, Dark Brushed Metal CLASSIC
![Classroom Dark Mode](https://addons.mozilla.org/user-media/addon_icons/2831/2831786-64.png?modified=81cd5895)
#20, Classroom Dark Mode
![Classroom Dark Mode](https://addons.mozilla.org/user-media/addon_icons/2831/2831786-64.png?modified=81cd5895)
![Arcade Classics](https://addons.mozilla.org/user-media/addon_icons/2778/2778118-64.png?modified=efd17cbf)
#21, Arcade Classics
![Arcade Classics](https://addons.mozilla.org/user-media/addon_icons/2778/2778118-64.png?modified=efd17cbf)
![Classical Search Bar](https://addons.mozilla.org/user-media/addon_icons/976/976824-64.png?modified=9ff8a87f)
#22, Classical Search Bar
![Classical Search Bar](https://addons.mozilla.org/user-media/addon_icons/976/976824-64.png?modified=9ff8a87f)
#23, XP Classic Theme
#24, Windows Classic
![UMN Classes to Calendar](https://addons.mozilla.org/user-media/addon_icons/2715/2715762-64.png?modified=2e44ed22)
#25, UMN Classes to Calendar
![UMN Classes to Calendar](https://addons.mozilla.org/user-media/addon_icons/2715/2715762-64.png?modified=2e44ed22)