Firefox has a large library of extensions and add-ons that can enhance your browsing experience. Here are 21 of the best Firefox extensions and add-ons:

  1. Adblock Plus: Blocks annoying ads and pop-ups on web pages.
  2. LastPass: A password manager that securely saves your login credentials and fills them in automatically.
  3. Grammarly: A grammar and spelling checker that can help you write better emails, posts, and articles.
  4. Pocket: Save articles, videos, and other content to read later across all your devices.
  5. HTTPS Everywhere: Ensures that you’re using a secure connection on websites that support HTTPS.
  6. uBlock Origin: A lightweight ad-blocker that’s fast and customizable.
  7. Privacy Badger: Protects your privacy by blocking third-party trackers.
  8. Tab Session Manager: Saves and restores your browsing sessions, including open tabs and windows.
  9. Dark Reader: Dark mode for any website. Adjusts brightness, contrast, and colors to make web pages easier to read.
  10. Honey: Finds and applies discount codes automatically when you shop online.
  11. Facebook Container: Isolates your Facebook activity from the rest of your web activity to protect your privacy.
  12. Bitwarden: Another password manager that lets you sync your passwords across all your devices.
  13. OneTab: Consolidates all your open tabs into a single tab, reducing memory usage and improving performance.
  14. Enhancer for YouTube: Adds extra features to YouTube, such as ad-blocking, automatic playback, and more.
  15. NoScript Security Suite: Blocks all scripts from running by default, allowing you to whitelist only the ones you trust.
  16. Privacy Possum: Protects your privacy by blocking web trackers, fingerprinting, and more.
  17. Tree Style Tab: Rearranges your tabs in a tree-like structure, making it easier to manage them.
  18. Tampermonkey: Allows you to install user scripts that can modify the appearance and functionality of websites.
  19. Ghostery: Blocks third-party trackers and provides detailed information on the trackers that are trying to follow you.
  20. HTTPS Checker: Shows whether the connection to a website is encrypted or not.
  21. ColorZilla: Lets you quickly pick colors from any web page and copy them to your clipboard.

These are just some of the best Firefox extensions and add-ons available. There are many more that can improve your browsing experience, so it’s worth exploring Firefox’s extensive library.