Re: F12
On Pale Moon --- just tried --- it merely opens the tabs Showcase --- If I want to view the Page Source, as often before, though not to look at people's uninteresting lives, it's under Tools on the menu-bar, or on the right-click menu.
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Of course with modern Devs *, the menu-bar is demode, and frequently has to be added after installation with oh, so many applications.
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* Earlier today, trying to find out what Adwaita was --- actually the default theme for Gnome, which this thread says the Gnome devs as is their wont are trying to make standard, preventing other themes... --- since the word used to come up in boot-up error messaging on OpenSUSE; these words rang true:
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Ever since GTK3 and gnome 3 its always been the sad story of change for the sake of change and the arbitrary removal of features.
At this rate, gnome 5 will be just a non-customizable blue wallpaper with the only UI a cursor with no right or left click functions and the only way to do anything is to learn some asinine key combo that only 8 armed space aliens can do.
GTK 5 will only have one UI option: the close button with little UI functionality requiring yet more asinine key combos, but this time only space aliens with 1000 arms can do them.
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https://www.bleepingcomputer.com/forums/t/758632/gnome-to-force-the-adwaita-theme-and-block-customization/