Recent answers to Almost every site is broken in Firefox 77https://support.mozilla.org/en-US/questions/12893332020-06-17T09:26:59-07:00jscher2000 said
On Reddit, someone said this worked for them:
(1) In a new tab, type or paste abou2020-06-17T09:26:59-07:00Eojiehttps://support.mozilla.org/en-US/questions/1289333#answer-1325062<em><p>jscher2000 <a href="#answer-1319424" rel="nofollow">said</a></p></em>
<blockquote>
On Reddit, someone said this worked for them:
(1) In a new tab, type or paste <strong>about:config</strong> in the address bar and press Enter/Return. Click the button accepting the risk.
(2) In the search box in the page, type or paste <strong>ppdc</strong> and pause while the list is filtered
(3) Double-click the <strong>browser.tabs.documentchannel.ppdc</strong> preference to switch the value from true to false
<em>I don't know what that does.</em>
More info on about:config: <a href="/en-US/kb/about-config-editor-firefox" rel="nofollow">Configuration Editor for Firefox</a>.
</blockquote>
<p>Just writing to share that changing browser.tabs.documentchannel.ppdc value to false did it for me. I've reverted all of the other config changes mentioned above to their original values so I can confirm only this piece worked.
</p><p>Firefox 77.0.1 x64
Windows 10
</p><p>PS: Thanks, jscher2000
</p>On Reddit, someone said this worked for them:
(1) In a new tab, type or paste about:config in the ad2020-06-04T04:42:11-07:00jscher2000https://support.mozilla.org/en-US/questions/1289333#answer-1319424<p>On Reddit, someone said this worked for them:
</p><p>(1) In a new tab, type or paste <strong>about:config</strong> in the address bar and press Enter/Return. Click the button accepting the risk.
</p><p>(2) In the search box in the page, type or paste <strong>ppdc</strong> and pause while the list is filtered
</p><p>(3) Double-click the <strong>browser.tabs.documentchannel.ppdc</strong> preference to switch the value from true to false
</p><p><em>I don't know what that does.</em>
</p><p>More info on about:config: <a href="/en-US/kb/about-config-editor-firefox" rel="nofollow">Configuration Editor for Firefox</a>.
</p>I mean... yeah, it kinda makes sense for people who set it to "true" or "yes", but IMHO it would be 2020-06-03T16:03:34-07:00milan2https://support.mozilla.org/en-US/questions/1289333#answer-1319049<p>I mean... yeah, it kinda makes sense for people who set it to "true" or "yes", but IMHO it would be a good general rule to parse values "no", "false", "0" and empty string, and ignore the flag. But I get this is a very niche problem. Lesson learned, thanks again to both of you for helping&nbsp;:)
</p>In a lot of cases the value of an environment variable doesn't matter, merely the presence is suffic2020-06-03T15:53:49-07:00cor-elhttps://support.mozilla.org/en-US/questions/1289333#answer-1319044<p>In a lot of cases the value of an environment variable doesn't matter, merely the presence is sufficient to make it active.
</p>
<ul><li><a href="https://support.mozilla.org/en-US/kb/performance-settings" rel="nofollow">https://support.mozilla.org/en-US/kb/performance-settings</a>
</li></ul>Thanks @cor-el. You're _almost_ right.
I had a system env variable MOZ_FORCE_DISABLE_E10S=0
I've ha2020-06-03T15:45:51-07:00milan2https://support.mozilla.org/en-US/questions/1289333#answer-1319038<p>Thanks @cor-el. You're _almost_ right.
</p><p>I had a system env variable MOZ_FORCE_DISABLE_E10S=0
</p><p>I've had it set to 1 because I was investigating other crashes, and when I fixed those, I changed it to 0, but apparently Firefox still had e10s turned off (I can confirm it was running in 1 process only).
</p><p>Anyway, both 77.0.1 and 78 nightly now work correctly (after removing the system variable and restarting). Thanks for helping!
</p>Do you possibly have disabled multi-process in Firefox by using the MOZ_FORCE_DISABLE_E10S=1 environ2020-06-03T15:19:53-07:00cor-elhttps://support.mozilla.org/en-US/questions/1289333#answer-1319026<p>Do you possibly have disabled multi-process in Firefox by using the MOZ_FORCE_DISABLE_E10S=1 environment variable?
</p>
<ul><li><a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1638652" rel="nofollow">Bug 1638652</a> - Content-Encoding not honored when e10s is turned off via browser.tabs.remote.autostart=false or MOZ_FORCE_DISABLE_E10S=1
</li></ul>
<p>(<i>please do not comment in bug reports<br><a href="https://bugzilla.mozilla.org/page.cgi?id=etiquette.html" rel="nofollow">https://bugzilla.mozilla.org/page.cgi?id=etiquette.html</a></i>)
</p>Hi milan2, another user reported a similar display problem:
https://support.mozilla.org/questions/122020-06-02T17:06:31-07:00jscher2000https://support.mozilla.org/en-US/questions/1289333#answer-1318598<p>Hi milan2, another user reported a similar display problem:
</p><p><a href="https://support.mozilla.org/questions/1289441" rel="nofollow">https://support.mozilla.org/questions/1289441</a>
</p><p>It looks similar to an old issue with Brotli encoding, but that is only used for HTTPS addresses, and your screenshot shows an HTTP connection. Very strange.
</p><p>I wonder whether it might be related to WebRender, a new graphics back end? Hopefully someone more conversant with troubleshooting graphics issues can work on that with you.
</p>Thanks for your input. In the end I have downgraded to Firefox 75, and kept my profiles intact with 2020-06-02T16:47:20-07:00milan2https://support.mozilla.org/en-US/questions/1289333#answer-1318592<p>Thanks for your input. In the end I have downgraded to Firefox 75, and kept my profiles intact with the `-allow-downgrade` flag.
</p><p>(LockWise still shows an empty screen though, see linked issue.)
</p>Let’s do a full clean re-install;
Note: Firefox comes in three or more folders on all computers.
The2020-06-02T02:16:18-07:00fredmcd-hotmailhttps://support.mozilla.org/en-US/questions/1289333#answer-1318262<p>Let’s do a full clean re-install;
</p><p>Note: Firefox comes in three or more folders on all computers.
They are;
</p><p>Maintenance: (Programs Folder) &lt;Windows Only&gt;
Firefox itself: (Programs Folder)
And two folders in the profile of each user on the computer
for each Firefox profile for that user.
</p><p>If you remove the Firefox folder, the user profiles would not be affected.
</p>
<hr>
<p><a href="http://www.mozilla.org/en-US/firefox/all/" rel="nofollow">Download Firefox For All languages And Systems</a> {web link}
</p><p>Save the file. Then <strong>Close Firefox. </strong>
</p><p>Using your file browser, open the <strong>Programs Folder</strong> on your computer.
</p><p><strong>Windows: </strong> C:\Program Files
C:\Program Files (x86) <strong>Note:</strong> Check Both Folders
</p><p><strong>Mac: </strong> Open the <strong> "Applications" </strong> folder.
<a href="https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac" rel="nofollow">https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac</a>
</p><p><strong>Linux: </strong> Check your user manual.
If you installed Firefox with the distro-based package
manager, you should use the same way to uninstall it.
See Install Firefox on Linux;
<a href="https://support.mozilla.org/en-US/kb/install-firefox-linux" rel="nofollow">https://support.mozilla.org/en-US/kb/install-firefox-linux</a>
</p><p>If you downloaded and installed the binary package
from the Firefox download page, simply remove the
folder Firefox in your home directory.
<a href="http://www.mozilla.org/firefox#desktop" rel="nofollow">http://www.mozilla.org/firefox#desktop</a>
</p>
<hr>
<p>Look for, and remove any <strong>Mozilla</strong> or <strong>Firefox</strong> program folders.
Do not remove the <strong>Mozilla Thunderbird</strong> folder if there is one.
</p><p><strong>Do Not</strong> remove any profile folders.
</p><p>After rebooting the computer, run a registry scanner
if you have one. Then run the installer.
</p>
<hr>
<p>If there is a problem, start your <strong>Computer</strong> in safe mode and try again.
</p><p><a href="http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode" rel="nofollow">http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode</a>
This shows how to Start all Computers in Safe Mode;
Free Online Encyclopedia
</p>The message from webhelp2 above is NOT Mozilla support.
2020-06-02T02:12:35-07:00fredmcd-hotmailhttps://support.mozilla.org/en-US/questions/1289333#answer-1318251<p>The message from <strong>webhelp2</strong> above is NOT Mozilla support.
</p>