Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
Navigation & Shortcut
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tridactyl
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vimium-FF
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Vimperator
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Vim-like key bindings, the ultimate plug-in for Firefox
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outdated in Firefox 57+
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Pentadactyl
A more powerful but complex alternative to Vimperator. The main focus of Vimperator is on usability, simplicity, stability and design while still preserving a powerful, modal browsing experience influenced by Vim. The aim of Pentadactyl is to create a complex beast, where hackers with too much free time can do any (un-)imaginable thing. Also Pentadactyl focuses more on 1:1 Vim compatibility.
FireNVim
FireNVim lets you use NeoVim directly from your browser. Contrary to other extensions, it does not open a new OS window. For detailed discussions, please refer to Firenvim Brings NeoVim into Your Browser .
Notes, Task, etc.
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Add to Wunderlist
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Todoist
task reminder
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ReminderFox
task reminder
Search Engine
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Add to Search Bar
Add any search on any page to the Search Bar. Just make a right click (Ctrl+click on a Mac) with the mouse pointer on top of the page's search box and choose "Add to Search Bar..."
If you don't know how to use the extension, have a look at the second image - it's a screencast showing it in action.
Security
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AdBlock Plus (block ads)
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NoScript (block scripts on website which makes web surfing faster and securer)
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Flashblock (block flash video on websites which makes web surfing faster and securer)
Sync & Sharing
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Shareaholic (the ultimate way to share web pages with yourself/friends)
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Xmarks (a standalone synchronization plug-in for Firefox)
Proxy
Due to technical reasons, PAC configuration based proxy cannot be set up on Firefox currently.
- Proxy SwitchyOmega
The best Proxy Switching plugin (for both Firefox and Chrome)
Feeds
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Pocket (save pages to read later)
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feedly (RSS feed)
Hack
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FireSSH (SSH client for Firefox)
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firebug (the ultimate way to modify/hack websites)
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Greasemonkey/scriptish
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cliget
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Multi Links Generates curl/wget commands that emulate the request as though it's coming from your browser allowing you to download protected files directly to a separate machine.
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lget
Allows you to initiate a direct download of a file given a url. -
PrintFriendly Make any web page Print Friendly & PDF
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Open in Chrome
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IETab
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Live HTTP Headers
View HTTP headers of a page and while browsing.
Downloading Tools
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Video DownloadHelper
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DownThemAll
The first and only download manager/accelerator built inside Firefox! -
FlashGot Mass Downloader