Greetings,
I invite you to follow instructions given on this link in order to change your default search settings in Firefox: https://support.mozilla.org/en-US/kb/change-your-default-search-settings-firefox
Also, can you please share me the clean logfile from AdwCleaner?
To do so:
- Launch AdwCleaner and then click on "Logfile" > "Clean" tab;
- Double-click on the most recent logfile and copy/...