Since last week, any Google search I make using Firefox is diverted to MS Bing, the screen refreshes itself several times before settling, and then the links given in the response do not work. I have run a malware check using my Avast antivirus software which has come back clear. I have tried checking 'Add-ons and themes' in Firefox, but only see a blank page with the identifier 'about:addons'. Searches using Google Chrome are fine. Can you advise please? Thanks and regards Vaughan birbeck