Problem:
Firefox has suddenly stopped opening some websites.
Solution:
- Type “about:config” (without quotes) in the address bar.
- Click the “Accept the Risks and Continue” button.
- Search for “network.trr.mode” (without quotes).
- Click the edit icon and set the value to 3. This forces Firefox to use DNS over HTTPS.
- Save the change and try opening the webistes again.
Problem:
Firefox suddenly does not play any sound.
You have tried uninstalling and reinstalling it but the problem still persists.
Quick Solution:
- Go to Windows Settings > Sound > Advanced Sound Options .
- Make sure Firefox is not muted or set to low volume.
Advanced Solution:
- Create a Firefox account and synchronize (make a backup of) your current settings.
- Uninstall Firefox using Windows Apps and features.
- Go to %APPDATA%\Mozilla and delete Firefox folder.
- Open regedit.exe, search for Firefox, and delete all the keys and values that can be found. This process will take some time. Just ignore any errors that may occur when some keys or values cannot be deleted.
- Restart your computer.
- Download Firefox offline installer.
- Install Firefox.
- Log in your Firefox account and restore your settings.
Problem:
You open a website using Firefox and some annoying videos automatically play.
Solution:
- Type about:config in the browser’s address bar and hit Enter.
- Click I accept the risk! button.
- Enter media.autoplay.enabled in the search text box.
- Double-click on the found row.
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