OK another thing to disable in Firefox. From v149
Split view.
The setting to toggle split view on or off is NOT in "Settings". It is in about:config.
browser.tabs.splitView.enabled set to "false".
I am grumpy as it is all to easy to accidentally invoke this feature when using a PinePhone in portrait mode.
With two tabs they are 2 cm wide and it is difficult to see the content.
To untile you have to hit the minuscule (on a PinePhone at 100% zoom) icon in the URL bar.
Currently the version of Firefox on the PinePhone (bookworm) is 140 esr.
So I discovered this when using Librewolf which is up to date.
Now disabled in both browsers. But we have a fair few devices here so something I will have to remember to do with each device.
I understand that some people will like this feature. But a nice button in "Settings" to disable/enable the feature would be appreciated.
Vivaldi has a similar feature, which is also easy to invoke by accident on a PinePhone.
BUT at least Vivaldi provides a good sized button on the status bar* at the bottom of the window that allows you to manage the currently tiled tabs.👍
*remember the old full-width-always-displayed status bar that Firefox used to have before the UI vandals set to work? Replaced with the very distracting status thing that bobs up and down all the time?
Eggs now in different baskets.