I should think about 4 years ago Yahoo withdrew the service that Firefox used to store bookmarks online.
if you only had 1 PC not a real problem but I had a multiboot desktop and a few laptops, log on from any one and everything was there. After the service was withdrawn and the servers were closed that option to use any machine and find all your old bookmarks was gone so I changed over to chrome. There was a a hell of an uproar by Firefox users at the time.
There was no clash or anything, just a change when Yahoo was taken over and the service was withdrawn.
Yahoo was taken over by Verizon media after Yahoo confessed about the monumental cock up of leaked data which saw millions of user details revealed including passwords and links to your isp account and phone numbers.
Verizon Media - Wikipedia
This was not officially disclosed at the time and was certainly not disclosed by my isp provider and I had calls from scammers who quoted my account number to me and tried to lock me out of my laptop. At the time I thought it was genuine but what gave it away was the use of Team Viewer not Citrix as screen sharing software.
On checking with my isp provider they admitted on the phone that there had been a breech but it was never publicly admitted that there had been one and my isp provider had big links wit Yahoo.
I luckily got away with it and closed it but I knew of others that were caught out and were asked to pay £200 to get the use of their machines back.
Just ran mine in safe mode again and back to normal and Edge is not responding and neither is Chrome.
Very strange how it worked for a little while last night.