FF 79.0 microstuter when scrolling

[Necronomicon]

Like what topic subject says, but happened after update to 79.0. Previous version worked fine.

[DanRaisch]

Moving to Firefox Support as no specific bug has yet been identified here.

Does the same thing occur if you launch the application in Mozilla Safe Mode? http://kb.mozillazine.org/Safe_mode

[Necronomicon]

I tried yesterday to experiment what might be the cause.
I made new profile and everything was fine. So I emptied current profile dir (copied to another location) and slowly started to move back dir after dir and file after file. Couldn't see what file causes the problem, because FF wouldn't load properly. But some file in FF profile root is causing that problem.

Some of these files are causing the problem:

addons.json
addonStartup.json.lz4
AlternateServices.txt
blocklist.xml
broadcast-listeners.json
cert_override.txt
cert9.db
compatibility.ini
containers.json
content-prefs.sqlite
cookies.sqlite
cookies.sqlite-shm
cookies.sqlite-wal
enumerate_devices.txt
extension-preferences.json
extensions.json
extension-settings.json
favicons.sqlite
favicons.sqlite-shm
favicons.sqlite-wal
formhistory.sqlite
handlers.json
key4.db
lightweighttheme-footer
lightweighttheme-header
logins.json
parent.lock
permissions.sqlite
pkcs11.txt
places.sqlite
places.sqlite-shm
places.sqlite-wal
pluginreg.dat
prefs.js
protections.sqlite
search.json.mozlz4
SecurityPreloadState.txt
serviceworker.txt
sessionCheckpoints.json
shield-preference-experiments.json
SiteSecurityServiceState.txt
storage.sqlite
storage-sync.sqlite
Telemetry.FailedProfileLocks.txt
times.json
TRRBlacklist.txt
webappsstore.sqlite
webappsstore.sqlite-shm
webappsstore.sqlite-wal
xulstore.json

I wil try tomorrow to remove file by file, to which one is causing it. It's a bit late today to do it.

Stranges thing is, that even if I installed (overwritten) previous version 78.0.2, FF wouldn't let me start because message something like this "cannot start firefox because there is...something new...not for older version, start FF with new profile". So, it is impossible to revert back with old profile. Bit stupid I may say.

[DanRaisch]

You would have been much better trying Safe Mode as I suggested. It might have been as simple a matter as an installed extension and not any of the original files of the Firefox profile.

[tomatoshadow2]

Yes, As Dan mentioned, it's not a real need or should to be changing Firefox's files in your profile, unless you know what you are doing.

[Necronomicon]

Not an extension, but some line/lines in prefs.js. I deleted several that might be the suspect, and it worked.