Go to about:config by typing it in your URL bar, then search for security.sandbox.content.level - change the value to 1 - this will fix the text issue.

This would normally happen if there is a an issue with the encoding and the HTTP response headers do not include the correct encoding. That way you can see gzip or otherwise compressed content instead of the real content.

You can check the network.http.accept-encoding prefs on the about:config page to see if they are default (http: gzip, deflate and https:gzip, deflate,br).

You can try these steps in case of issues with web pages:

You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

• hold down the Shift key and left-click the Reload button
• press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• press "Command + Shift + R" (Mac)

Clear the cache and remove the cookies from websites that cause problems via the "3-bar" Firefox menu button (Options/Preferences).

"Clear the cache:

• Options/Preferences -> Privacy & Security -> Cached Web Content: "Clear Now"

"Remove the cookies" from websites that cause problems.

• Options/Preferences -> Privacy & Security -> "Use custom settings for history" -> Cookies: "Show Cookies"

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.

• switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Appearance
• do NOT click the "Refresh Firefox" button on the Safe Mode start window

• https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

Mkll said

Go to about:config by typing it in your URL bar, then search for security.sandbox.content.level - change the value to 1 - this will fix the text issue.

I do not have that variable in my about:config:

security.sandbox.content.leve

cor-el said

You can check the network.http.accept-encoding prefs on the about:config page to see if they are default (http: gzip, deflate and https:gzip, deflate,br).

That is what I have in my about:config and with those valuesl

---

You can try these steps in case of issues with web pages:

You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

• hold down the Shift key and left-click the Reload button
• press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• press "Command + Shift + R" (Mac)

Clear the cache and remove the cookies from websites that cause problems via the "3-bar" Firefox menu button (Options/Preferences).

"Clear the cache:

• Options/Preferences -> Privacy & Security -> Cached Web Content: "Clear Now"

"Remove the cookies" from websites that cause problems.

• Options/Preferences -> Privacy & Security -> "Use custom settings for history" -> Cookies: "Show Cookies"

Did not help. I will try restarting in Safe Mode

security.sandbox.content.level would possibly only help if there is an issue with accessing a specific font, but your case looks different like I wrote above.

Did you try my above suggestions?

You can also check the Network Monitor for the request and response headers and the server response.

• https://developer.mozilla.org/en/Tools/Network_Monitor

cor-el said

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.

Tried Safe Mode, didn't help. It is only that one site, I'm wondering what could be on it that could be contributing to the problem.

Verify that you meet the System Requirements (GTK+ and GLib) for the Firefox release you want to use.

• https://www.mozilla.org/en-US/firefox/system-requirements/
• https://www.mozilla.org/en-US/firefox/58.0.1/system-requirements/
• https://www.mozilla.org/en-US/firefox/52.6.0/system-requirements/

I started Firefox in safe mode again, and noticed this output on boot up ( navigating to the page caused no output):

==

1517409722664 addons.webextension.{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d} WARN Loading extension '{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}': Reading manifest: Error processing background.persistent: Event pages are not currently supported. This will run as a persistent background page. 1517409722677 addons.webextension.{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d} WARN Loading extension '{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}': Reading manifest: Error processing permissions.7: Unknown permission "unlimitedStorage" 1517409722684 addons.webextension.{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d} WARN Loading extension '{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}': Reading manifest: Error processing devtools_page: An unexpected property was found in the WebExtension manifest. 1517409722684 addons.webextension.{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d} WARN Loading extension '{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}': Reading manifest: Error processing minimum_opera_version: An unexpected property was found in the WebExtension manifest. 1517409722684 addons.webextension.{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d} WARN Loading extension '{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}': Reading manifest: Error processing storage: An unexpected property was found in the WebExtension manifest. 1517409722728 addons.webextension.{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d} WARN Please specify whether you want browser_style or not in your browser_action options. ERROR: ld.so: object '/awips2/python/lib/libpython2.7.so' from LD_PRELOAD cannot be preloaded: ignored. 1517409724701 addons.webextension.jid1-xUfzOsOFlzSOXg@jetpack WARN Loading extension 'jid1-xUfzOsOFlzSOXg@jetpack': Reading manifest: Error processing permissions.4: Unknown permission "unlimitedStorage" 1517409724723 addons.webextension.jid1-xUfzOsOFlzSOXg@jetpack WARN Please specify whether you want browser_style or not in your page_action options. Promise resolved after context unloaded