1915987 - browser.tabs.hoverPreview.enabled setting keeps reenabling itself

Status: RESOLVED DUPLICATE of bug 1914756

(Firefox :: Tabbed Browser, defect)

Description

[othermailofc]

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

Steps to reproduce:

Ever since the latest update I've been trying to disable too much stuff showing on mouseovering tabs. I figured two settings in about:config are responsible for this browser.tabs.hoverPreview.showThumbnails and browser.tabs.hoverPreview.enabled
I disabled them. The former one stays disabled, but browser.tabs.hoverPreview.enabled reenables itself each time I restart the browser.
There have been other reports of this issue, including here:

1. https://bugzilla.mozilla.org/show_bug.cgi?id=1914155
2. https://www.reddit.com/r/firefox/comments/1f0d8h8/why_do_i_need_to_keep_disabling/
3. https://connect.mozilla.org/t5/discussions/tab-previews-are-annoying/m-p/65950
   to list a few.
   I myself have tested it on two PCs and many different browser profiles, most of which are barely affected by any sort of customization.

Actual results:

The browser.tabs.hoverPreview.enabled setting reverts to being enabled on browser restart.

Expected results:

It should stay disabled if it's been disabled.