Install many add-ons(20 add-ons or even more), and perform a data synchronization.
Add-ons Collection Information:
_User id: 12325762
Collection name: fenix_
Sync successfully.
The browser's sync function lose effect. Nothing happens after tapping "Sync Now".

Can it be a dupe of this? https://github.com/mozilla-mobile/fenix/issues/15818
After this issue is resolved, I'm going to make a monthly donation to Mozilla to buy some coffee for the engineers.
https://donate.mozilla.org
Please fix it soon, thanks!
Many days have passed and still nothing has happened.
Most helpful comment
After this issue is resolved, I'm going to make a monthly donation to Mozilla to buy some coffee for the engineers.
https://donate.mozilla.org