This is a Windows 10 Pro PC. I tried to download a PCB schematic and got a bundle of viruses instead with toolbars and Chinese popups that brought my PC to a halt.
I ran Adwcleaner and Malwarebytes which got rid of the bulk, but my one-click search engine in Firefox 42 remains infected.
If I highlight and right click a word, I get 'search YourSeachResults for "xyz"' instead of s'earch Google. for "xyz"'.
When I choose Tools > Options > Search and delete YourSearchResults from the One-click search engine defaults, it goes back to Google.
When I close Firefox and restart, the One-click search is set back to YourSearchResults.
I've tried Open Menu > Open Help Menu > Trouble Shooting Information > Refresh Firefox
I've tried Open Menu > Open Help Menu > Trouble Shooting Information > Profile Folder > Show Folder > and deleted 'search JSON File', 'search-metadata JSON.File' and the 'Search folder' but they rebuild with the same issue.
I've tried uninstalling and reinstalling Firefox.
How can I get rid of this please?