Can't read text in web forms since firefox uses dark theme by default [duplicate]

Solution 1:

This is a known issue. You can find bug reports here:

Bug 70315 - text in menus and boxes unreadable if using dark GTK theme

Bug 519763 - dark linux gtk theme makes pages look bad; "use system colors" should apply to input elements as well as fonts, or separate option needed

The suggested work around is to create a userContent.css file in your firefox profile as per these instructions from the Arch Wiki.

Solution 2:

One solution is to edit the userContent.css for firefox. I had this issue previously with the Ubuntu Software center and did something similar.

You can find a related post about it here: http://forums.fedoraforum.org/showpost.php?p=1703251&postcount=3

I am not sure if this fix still works since the 16.04 update, but it should be applicable.