For many weeks I ha no complaints, browsers and Thunderbird mail opened instantly. Then 3 days ago all changed.
It began with Firefox 62.0.3 Quantum taking 7 minutes to open and now 10 minutes plus time to load the screen. Thunderbird began doing the same. Edge browser loads much faster almost instantly.
I used the Refresh button in Firefox and for the next hour all was fine, but now it is slowing down again.
I have set Firefox not to save History, only 3 Add ons.
I used Malwarebytes.. it found nothing. No Virus problems etc.