1802864 - Scrolling with mouse does not work on tabbar

Status: RESOLVED WORKSFORME

(Core :: Panning and Zooming, defect)

Description

[tobias]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:107.0) Gecko/20100101 Firefox/107.0

Steps to reproduce:

Scrolling with scrollwheel on tabbar

Actual results:

scrolls tabs: it opens left or right tab content

Expected results:

list of tabs should be scrolled, without changing currently open tab

Comment 1

[tobias]

I also restarted Firefox in safe mode, but result is same.
I think it happened when switching to Firefox 107.

I am using

• Wayland
• KDE
• Arch
  is this helps to narrow the cause down.

Comment 2

[Negritas Sergiu, Desktop QA]

Hello! I have tried to reproduce the issue on with firefox 109.0a1(2022-12-02) on Ubuntu 22.04 but unfortunately I wasn't able to reproduce the issue on my end.
Could you please answer the following question in order to further investigate this issue?

1. Does this issue happen with a new profile? Here is a link on how to create one: https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles
2. Does this issue happen in the latest nightly? Here is a link from where you can download it: https://www.mozilla.org/en-US/firefox/channel/desktop/
3. Do you have any addons installed if so can you list them?

Comment 3

[BugBot [:suhaib / :marco]]

The Bugbug bot thinks this bug should belong to the 'Core::Panning and Zooming' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 4

[Timothy Nikkel (:tnikkel)]

If it just started happening with the new version you could use https://mozilla.github.io/mozregression/ to find the exact change that caused it?

Comment 5

[tobias]

Does this issue happen with a new profile? Here is a link on how to create one: https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles

No. With same Linux user and a new profile it does not happen.

Does this issue happen in the latest nightly? Here is a link from where you can download it: https://www.mozilla.org/en-US/firefox/channel/desktop/

It also happens with Nightly: 109.0a1 (2022-12-04) (64-bit)

Do you have any addons installed if so can you list them?

I also tested troubleshoot mode, where all addons/extensions are disabled and it also happens there, but those are the ones I have enabled:
Extensions:

• KeepassXC-Browser
• Reuse Tab
• uBlock Origin
• User-Agent Switcher and Manager
• vue.js devtools
• xdebug helper

Plugins:

• OpenH264
• Widevine

Comment 6

[tobias]

Ouch.
No "we" have a problem: Since I tested Firefox Nightly with my "broken" profile, I cannot switch back to test older Firefox versions (to trace regression).
"Luckily" it still happens with Nightly, so I can still help / debug / check what is going on.

Comment 7

[Botond Ballo [:botond]]

If the difference between the working profile and the broken profile is not an addon, another thing it could be is a modified preference. Could you attach the contents of the page about:support in the broken profile? That includes a list of modified preferences among other things.

Comment 8

[tobias]

Attachment: about:support of broken profile

Comment 9

[tobias]

I attached the entire file.

Comment 10

[tobias]

I just looked into it. And I never ever modified that many preferences on my own.
(this profile is rather old, as I kept moving it from my old computers…)

Comment 11

[tobias]

I reset most of settings in "Important Modified Preferences", except of security, privacy.
Still it happens.
Are those the only changes that exist?

(attached new version)

Comment 12

[tobias]

Attachment: about:support of broken profile 7.12.22

Comment 13

[tobias]

I now searched for scroll in about:config and only showed changed values:
toolkit.tabbox.switchByScrolling was set to true.
When I set it to false it is working.

So it is solved!
But I have no idea/clue when/how I changed this:
https://support.mozilla.org/en-US/questions/1285434

It seems that this is only possible via config.

Comment 14

[Botond Ballo [:botond]]

Glad you got it sorted out!

I'm not fully clear either on what criteria cause a pref to show up in "Important Modified Preferences". Like you, I have many entries in there which I have not manually modified. On the other hand, it would have been good for toolkit.tabbox.switchByScrolling to be considered "important" in this scenario.