拡張機能はブラウザー向けのアプリのようなものです。
They add features to Firefox to make browsing faster, smarter, or just plain fun.
Adblock Plus
広告やトラッキングで困っていませんか？ Adblock Plus でコントロールして自分好みに変えてしまいましょう。
10,926,332 人のユーザー
Tab2QR
Send the page you are currently viewing to your mobile device. QR codes are generated instantly in browser and never leave your computer. Implemented with WebExtensions API and compatible with Firefox 57+.
6,970 人のユーザー
Flash-HTML5 Player for YouTube™
Play YouTube™ Videos in Flash or HTML5 Player
44,906 人のユーザー
Text MultiCopy
Copy Text multiple times before pasting
2,215 人のユーザー
Enhancer for YouTube™
YouTube™のユーザーエクスペリエンスを向上させる多数の機能。
510,860 人のユーザー
SoundFixer
Lets you fix annoying sound problems in YouTube videos and such. Like audio in one channel only, too quiet or too loud. (Unfortunately, doesn't work on many other websites because of cross-domain issues — but it does work on YouTube.com!)
13,740 人のユーザー
YouTube High Definition
YouTube High Definition is a powerful tool that will let you automatically play all YouTube videos in HD (High Definition), turn off annotations, change video player size, auto stop videos, auto mute videos, control embedded videos and much more.
201,319 人のユーザー
Video Speed Controller
Speed up, slow down, advance and rewind any HTML5 video with quick shortcuts.
31,783 人のユーザー
Wikiwand: Wikipedia Modernized
Good old Wikipedia gets a great new look
17,609 人のユーザー
Wikipedia Peek
Shows previews of linked articles on Wikipedia pages.
3,367 人のユーザー
Wikipedia Context Menu Search
Search for highlighted text on Wikipedia via the context menu.
2,986 人のユーザー
Random Unusual Wikipedia new tab
Redirects to a random unusual Wikipedia page when you open a new tab, because when you're opening a new tab you're looking for a distraction and that distraction might as well be a weird fact. Or show random Cognitive Bias, or Philosophical concept.
70 人のユーザー
New Tab Override (WebExtension)
New Tab Override brings back the ability to change the page which is shown when opening a new tab.
108,893 人のユーザー
ツリー型タブ (Tree Style Tab)
タブをツリー状に表示します。
133,222 人のユーザー
Tab Auto Refresh
Automatically refresh tabs based on custom time intervals
55,213 人のユーザー
OneTab
タブが多すぎてお困りですか？タブをリスト化してFirefoxの実行速度をスピードアップさせましょう OneTabが日本語でも利用可能になりました！
83,387 人のユーザー