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Since a update a few weeks ago Firefox doesn't seem to keep settings done in about:config. I noticed this for example because I use a changed dpi setting

layout.css.devPixelsPerPx=1.5

After an update this was reset to -1.0. Changing this to 1.5 again however works only temporarily. After restarting Firefox the setting is gone.

What may be wrong here and how can I fix it?

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  • I was using the web interface. – student May 24 '18 at 21:44
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You can edit the prefs.js file in the Firefox profile folder with a plain text editor like Notepad and remove the line with the layout.css.devPixelsPerPx pref or change the value to 1.0

user_pref("layout.css.devPixelsPerPx", "1.0"); 

From https://support.mozilla.org/en-US/questions/964888

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  • Thanks, I manually added the key to my user.js and now it seems to work after a reboot. Maybe you could include this information explicitly into your answer then I can accept it. – student May 24 '18 at 20:59

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