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# Firefox Quantum rendering problems

Hi there, I'm trying out Fedora 27 and thus Firefox quantum.

FF quantum is really fast but there are quite some pages which gets rendered incorrectly. Missing text.

Simple example is: https://fedoramagazine.org/

It looks like this: https://imagebin.ca/v/3h0DrwkEyN2q

(If this is the wrong place for this, I don't know where to report it to the firefox project. )

Anybody else having this?

Manfred

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bug report to mozilla. or bug report to fedora 27 since it is still beta?

( 2017-11-12 15:22:59 +0000 )edit

Thanks, now I found bugzilla.mozilla.org where I opened a bug report.

( 2017-11-12 16:02:04 +0000 )edit

It is displayed properly here. When you select the text, is it readable? It could simply be that you have some GTK theme active that is displaying text in white color and thus making it hard to read.

( 2017-11-14 07:43:50 +0000 )edit

Ok, I use Xfce4. Trying different themes didn't change anything. If I run Cinnamon instead of Xfce4 the same happens.

( 2017-11-14 18:49:59 +0000 )edit

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It seems the problem is solved.

For some reason I deinstalled an Opentype font which also contained some directories of woff and woff2 files. I didn't notice it before.

So, after deleting the font and running sudo fc-cache -fsv things are fine now. Firefox 57 works ok and is much faster then the previous version.

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I was wrong. I was just accidentally happening that it worked. Shortly after the problem was back. However, as I learned here: https://bugzilla.mozilla.org/show_bug... it is a bug in FF which can be worked around like this:

This is probably another example of sandbox-related font issues, like bug 1412090. Assuming this is correct, it should be fixed by the latest Nightly builds; a workaround on older versions (like the 57.0 release) is to set security.sandbox.content.level to 1 (or possibly 2?) in about:config, instead of the default level 3.

( 2017-11-16 18:25:04 +0000 )edit

Did you enable a dark Gtk+ theme in your desktop environment? If yes, you probably allowed theming the content process in Firefox. In about:config, search for widget.content.allow-gtk-dark-theme and widget.content.gtk-theme-override and reset them to their default values.

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Both are set to false.

( 2017-11-14 18:51:09 +0000 )edit

I can mark the invisible text and paste it in an editor. So it seems it is a white font with a white background.

( 2017-11-14 19:04:17 +0000 )edit

Do you have a userContent.css file in your firefox profile?

( 2017-11-14 19:12:56 +0000 )edit

No, I do not have any userContent.css file.

( 2017-11-14 19:32:51 +0000 )edit

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