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Make Firefox your default browser | Firefox Help - Mozilla Support
Make Firefox your default browser on Windows | Firefox Help
Add or remove a search engine in Firefox | Firefox Help - Mozilla …
How to set the home page | Firefox Help - Mozilla Support
Troubleshoot Firefox crashes (closing or quitting unexpectedly)
Troubleshoot and diagnose Firefox problems | Firefox Help
Change your default search settings in Firefox | Firefox Help
Thunderbird and Junk / Spam Messages | Thunderbird Help
Private Browsing - Use Firefox without saving history
How to install Firefox on Windows | Firefox Help - Mozilla Support