If your Firefox location bar is offering strange and erroneous type-ahead suggestions, there are a few things you can try to fix the issue:
1. Clear your browsing history: Sometimes, the location bar's suggestions can become corrupted due to outdated or incorrect data in your browsing history. To clear your history, go to the Firefox menu, click "History," and then click "Clear Recent History." In the dialog box that appears, select the time range you want to clear, choose "Browsing & Download History" and "Form & Search History," and then click "Clear Now."
2. Disable search suggestions: If the issue persists, you can try disabling search suggestions. To do this, go to the Firefox menu, click "Preferences," and then click "Search." Under the "Search Suggestions" section, uncheck the "Provide search suggestions" option.
3. Reset your Firefox profile: If the issue still persists, you can try resetting your Firefox profile to its default settings. To do this, go to the Firefox menu, click "Help," and then click "Troubleshooting Information." In the page that appears, click the "Refresh Firefox" button to reset your profile.
If none of these solutions work, you may want to try reinstalling Firefox or contacting Firefox support for further assistance.