Over time, browsers can slow down due to cached files, cookies, or extensions. To speed up Firefox, start by clearing your cache and cookies via Settings > Privacy & Security > Cookies and Site Data. Next, review your installed extensions and disable any that aren’t necessary through Add-ons > Extensions. Enabling Hardware Acceleration under Settings > General > Performance allows Firefox to use your computer’s GPU for smoother browsing. If these steps don’t help, consider refreshing Firefox, which restores default settings while keeping bookmarks and passwords.