1912819 - browser.tabs.hoverPreview.enabled disables tooltips for unloaded tabs

Status: REOPENED

(Firefox :: Tabbed Browser, defect)

Description

[Yves Goergen [:ygoe]]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:129.0) Gecko/20100101 Firefox/129.0

Steps to reproduce:

1. Have some tabs open
2. Restart Firefox 129
3. Hover the tab that hasn't been loaded yet

Actual results:

nothing

Expected results:

the title is visible in the tooltip somehow

Disabling the "browser.tabs.hoverPreview.enabled" setting makes it work. I guess the tab preview feature has an undesired side effect, or regression.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

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

Comment 2

[Yves Goergen [:ygoe]]

Seems to work again now in version 129.0.1.

Comment 3

[Dão Gottwald [:dao]]

(In reply to Yves Goergen from comment #2)

Seems to work again now in version 129.0.1.

Alright, thanks. Please let us know if this happen again.

Comment 4

[Yves Goergen [:ygoe]]

Alright. As it seems, it's broken again, but worse. Now none of the tooltips appear on tab headers. Neither loaded nor unloaded. I have resized and minimised the window and switched tabs, but there's not a single reaction when hovering tabs now (besides the background colour change). No tooltip, no preview. Something's not right with this feature.

Comment 5

[Dão Gottwald [:dao]]

Are there any errors in the browser console?

Comment 6

[Yves Goergen [:ygoe]]

Yes, several. It looks like there's no export feature, so I'll try to attach a screenshot.

Hm, no, pasting the image doesn't work. Please provide a way to provide the screenshot or the console contents.

Comment 7

[Dão Gottwald [:dao]]

Please attach the screenshot here: https://bugzilla.mozilla.org/attachment.cgi?bugid=1912819&action=enter

Comment 8

[Yves Goergen [:ygoe]]

Attachment: Firefox console.png

Comment 9

[Yves Goergen [:ygoe]]

I'm seeing this bug regularly after a short while. Let me try to find the pattern that triggers it. I'll pay more attention to this the next days.

Comment 10

[Chris Peterson [:cpeterson]]

Yves, can you please share your Firefox's about:support troubleshooting information? Have you changed any other about:config prefs or have any extensions installed?

Comment 11

[Yves Goergen [:ygoe]]

Yes, I have installed add-ons and changed settings. I've attached the support data.

Meanwhile I can say that the only parameter that seems to affect this bug is time. It just breaks after a while of using and not using Firefox. Restarting fixes it immediately, but it will break again soon (hours or at most 2 days).

Comment 12

[Yves Goergen [:ygoe]]

Attachment: firefox-support-data.json

Comment 13

[Yves Goergen [:ygoe]]

One more issue to add to this: The feature cannot even be disabled. When I do, it will reenable after some time or restarting Firefox.

Comment 14

[Yves Goergen [:ygoe]]

It's really annoying what has changed there. A new feature was introduced that breaks completely after just a few days of browser uptime and at the same time, it was made mandatory in a way that it cannot be permanently disabled (disabling it is reverted after each browser restart). Is somebody even considering this regression?

Comment 15

[Sören Hentzschel]

it was made mandatory in a way that it cannot be permanently disabled (disabling it is reverted after each browser restart).

Please check your Firefox version. This was fixed in Firefox 131.