How to set the default zoom according to the screen in Linux level?

Starting from the same account, I can use different types of screens: low and high DPI. I would like to have the font size (and more generally, the zoom level) right of each screen.

To set the default zoom level, you can set the layout.css.devPixelsPerPx, but we can't define it it fixed-value, which is not OK, because I would like that the value depends on the environment (as for the font size in the menu which is always OK, because it depends on the resource Xft.dpi X 11).

Note: I have several profiles, while it is not even possible to write a wrapper that could modify the prefs.js file, because I don't know in advance which file would I need to change.

What can I do?

One possibility would be to use the mozilla.cfg file in the Firefox program folder.
This file can contain JavaScript that runs with full chrome privileges and it it not difficult game of the pref layout.css.devPixelsPerPx to a correct value for the screen currently attached.
You will need to know how to calculate the dimensions of the screen.

Tags: Firefox

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