User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.89 Safari/537.36 Steps to reproduce: Firefox quantum firefox-57.0-0.8.fc27. FF quantum is really fast but there are quite some web pages which gets rendered incorrectly. There is text missing. Actual results: Simple example is: https://fedoramagazine.org/ It looks like this: https://imagebin.ca/v/3h0DrwkEyN2q Anybody else having this? Expected results: The various articles listed in https://imagebin.ca/v/3h0DrwkEyN2q should have text. Just try going to https://fedoramagazine.org/ using the previous firefox 56

Here I used google chrome because firefox quantum is currently unreliable on my system.

This page: https://bugzilla.mozilla.org/show_bug.cgi?id=1416569 looks like follows: https://imagebin.ca/v/3h3PFxPPutxg

Please make sure you have the latest graphics driver: https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

I have the latest intel driver Fedora 27 offers: xorg-x11-drv-intel-2.99.917-31.20171025.fc27.x86_64

I have started Firefox with a new profile and save the troubleshooting informatin which I have appended here:

Problem is solved now: For some reason I deinstalled an Opentype font which also contained some directories of woff and woff2 files. I didn't notice it before. Then I accidentally noticed that firefox works ok again.

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.

Jonathan, thanks a lot for that. Things are weird. When I had posted that it is solved, and later restarted Firefox the problem was there again. So I felt like being stupid or something similar. Now when I set security.sandbox.content.level to 1 it seems (I'm cautious now with my wording) rendering works ok reliably.

OK, that tends to confirm this is the same issue as bug 1412090; marking as a duplicate.

I need to make a remark in my calendar to make sure I will set that value back to 3 some time in the future. Is there any estimation when the fix could arrive in the distros? In my case it is Fedora 27. If not I will check at beginning of December if it is fixed.

Currently, the fix is on track for Firefox 59, but I'm requesting uplift to Firefox 58 as well.

Thanks, good to know. I will make sure not to forget that security.sandbox.content.level change I made

Just to let you know. Now, having installed firefox 58.0-3 in Fedora 57 and resetting security.sandbox.content.level to the default of 3 things are still fine. No problems detected so far.