Firefox on Mac might suddenly refuse to load web pages after you tweak permission settings. It’s confusing because the error isn’t obvious—no pop-up messages, just a blank screen or endless spinner. Here’s how to fix it without wiping your browser data.
A simple reset can save time.
1. Check if ‘Block Pop-ups’ is Overactive
Firefox has a built-in pop-up blocker, but sometimes it blocks all site content accidentally. Go to Firefox > Preferences > Privacy & Security, then scroll down to "Block pop-ups." Ensure it’s checked—but don’t disable it entirely.
2. Re-enable Site-Specific Permissions
If you’ve manually blocked a site (e.g., for camera or location), Firefox might still be blocking it. Click the padlock icon next to the URL in the address bar, then check if "Permissions" is set to "Allow" for each service. If not, reset to default.
3. Reset Permissions via Browser Config
If manual fixes fail, Firefox stores permission settings in a hidden file. Open Terminal and type:
defaults delete com.mozilla.firefox NSUserDictionaryReplacement
This resets site permissions without touching passwords or bookmarks.
Final thoughts
Browser permission issues are frustrating, but they’re usually fixable with small tweaks. Always check pop-up settings first—most of the time it’s a simple toggle gone wrong.
Firefox on Mac is powerful, and these fixes help keep it running smoothly without losing your custom setup.