2012279 - facebook UI glitch/hitching when scrolling with Smooth scroll disabled.

Status: RESOLVED DUPLICATE of bug 2010481

(Core :: Web Painting, defect)

Description

[:hello]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:147.0) Gecko/20100101 Firefox/147.0

Steps to reproduce:

Continously middle mouse scroll on facebook causes the UI to the left and right to erratically hitch/glitch if smooth scrolling is disabled.
https://imgur.com/a/ZkxgnOK highlighted parts that hitch/glitch

This is on firefox desktop.
I also use ublock on medium mode but disabling ublock for the facebook page does not fix the weird hitching with the UI when scrolling.

Actual results:

https://imgur.com/a/ZkxgnOK
Highlighted sides that suffer from the hitching/glitch

Only happens on firefox as edge doesn't suffer from the issue when continously scrolling with middle mouse button

Expected results:

Not wierd hitching with the UI when scrolling.

Comment 1

[:hello]

Minor update.

I noticed it also happens VERY occasionally even with smooth scrolling enabled but with smooth scrolling disabled it happens MUCH more frequently.

Comment 2

[Alice0775 White]

Regression window:
https://hg-edge.mozilla.org/integration/autoland/pushloghtml?fromchange=a55e6a8352a8395f09179cf38ab75a7ad69e1d25&tochange=1e6f6deb5ae17dfbda69db09f882c80faf69e0c0

Comment 3

[BugBot [:suhaib / :marco]]

Set release status flags based on info from the regressing bug 1730749

:botond, since you are the author of the regressor, bug 1730749, could you take a look? Also, could you set the severity field?

For more information, please visit BugBot documentation.

Comment 4

[Botond Ballo [:botond]]

I believe this was fixed by bug 2010481.

Alice, would you be able to confirm that the issue no longer occurs in the 2026-01-25 nightly (which contains the fix for bug 2010481)?

Comment 5

[Alice0775 White]

Yes.
I can reproduce the issue on Nightly149.0a1 (BuildID: 20260124085715) Windows 11.
And I verified that the issue has been fixed on Nightly149.0a1 (BuildID: 20260126094845).

Comment 6

[Botond Ballo [:botond]]

Thanks very much for checking!

I'm going to close this as a duplicate.

Comment 7

[:hello]

(In reply to Botond Ballo [:botond] from comment #6)

Thanks very much for checking!

I'm going to close this as a duplicate.

*** This bug has been marked as a duplicate of bug 2010481 ***

So it's just a waiting game now to get the fix to regular firefox?

Comment 8

[Botond Ballo [:botond]]

(In reply to :hello from comment #7)

So it's just a waiting game now to get the fix to regular firefox?

Yep. The fix landed on the Nightly channel in Firefox 149, but was backported to Firefox 148 (current Beta channel) as well. According to the release calendar, that will be out on February 24.

Comment 9

[Botond Ballo [:botond]]

(In reply to Botond Ballo [:botond] from comment #8)

(In reply to :hello from comment #7)

So it's just a waiting game now to get the fix to regular firefox?

Yep. The fix landed on the Nightly channel in Firefox 149, but was backported to Firefox 148 (current Beta channel) as well. According to the release calendar, that will be out on February 24.

As an update on this: the fix was further backported to Firefox 147, and so should appear in the next 147 dot-release, 147.0.3. (Not sure what the exact release timeline for that is.)