Here's a new profile, just default zoom set to 150% (ublock origin installed system-wide)
https://i.imgur.com/Z3MO8sr.png
https://i.imgur.com/hgscGrb.png
https://i.imgur.com/07QI1IU.png
https://i.imgur.com/owZm12J.png
What is even going on?
Surely you can see the difference between the font sizes for the ublock origin popup, and the enormous fonts on the settings page.
It's totally broken?
In any case, I checked out Chromium, and the equivalent setting is labeled "Page zoom" and affects extension popovers as well. As far as I know, extension popovers are not web pages, so your expectation (and Chromium's behavior) seem to be a bug - either in the settings UI, or in the way the zoom setting affects extension popovers.
Are you saying it has unusual default settings, and that 150% zoom is one of them? For what it's worth in my experience of installing Firefox which are probably done half dozen times in the past year or so on various devices, I haven't experienced anything like this.
The only things correctly sized are the page and the hamburger menu.
Do you not see the oversized tab-bar, the tiny icons on the tab-bar and address bar, the tiny ublock origin dialog, and the huge settings page?
It's hard to understand what you think is unusual. Everything in the browser is displayed normally. The page is different because you used a different zoom, and it zoomed the way Page is normally do.
Are you suggesting that the browser tab bar and settings pages should also grow or shrink if you zoom in or out on a particular web page inside of a tab?
I think you're not fully appreciating how unclear you're being with all of this.
I run a 150dpi screen.
What the problem with running a "96dpi" application on a 150dpi screen?
The text is overall too small.
What text?
Literally all the text in the entire application is too small.
What do I want?
I want to make the text bigger, so I have an easier time reading it.
Is there an application that does what I want?
Yes, Chrome does what I want.
What does Chrome do?
I set the default zoom level to 150% and it makes all the text bigger.
What text does it make bigger?
It makes all the text bigger, and the icons too.
What's the problem with Firefox?
I set the zoom level to 150% and some of the text is fine, some of it is way too small, some of it gigantic.
Why is that a problem?
I have a hard time reading text that's either too small or too big.
What's the problem with the tab bar?
It's too tall.
What's the problem with the icons?
They're too small!
This is just a you problem?
Surely fucking not. Surely I am not the only person running a web browser above 96dpi (on x11).
Is this a X11 problem?
No, Chrome works fine.
Is this a really complicated problem?
No, making fonts the correct size for comfortable reading isn't complicated.