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ALL text showed on my screen are [A]

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suddenly 2 days ago, everything on my firefox window showed is [A]. I searched for solution, and the suggestion is not keep the "Allow pages to choose their own fonts, instead of your selections above" which is already checked. However, it's all [A] see attachment. If I unchecked the box, everything looks pretty much normal, except when I search, the search word would become [A] at some website. I tried to reinstall the firefox, but didn't help at all. Is there anything I can do to fix the problem?

suddenly 2 days ago, everything on my firefox window showed is [A]. I searched for solution, and the suggestion is not keep the "Allow pages to choose their own fonts, instead of your selections above" which is already checked. However, it's all [A] see attachment. If I unchecked the box, everything looks pretty much normal, except when I search, the search word would become [A] at some website. I tried to reinstall the firefox, but didn't help at all. Is there anything I can do to fix the problem?

Chosen solution

One other thing to check:

Firefox 56 ratcheted up the security sandbox, limiting which files pages can use on your system. This apparently prevents Firefox from using font files in a "suitcase" or "Adobe Type 1" format. You might have those same fonts in TrueType or OpenType format, but Firefox may not be seeing them for one reason or another.

As a temporary workaround, you can reduce the sandbox level back to what it was in Firefox 52-55 as follows:

(1) In a new tab, type or paste about:config in the address bar and press Return. Click the button accepting the risk.

(2) In the search box above the list, type or paste sand and pause while the list is filtered

(3) Double-click the security.sandbox.content.level preference and change the value from 3 to 1 and click OK

That change won't take effect until the next time you quit and restart Firefox.

Does that work on your Firefox?

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Additional System Details

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  • User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/603.3.8 (KHTML, like Gecko) Version/10.1.2 Safari/603.3.8

More Information

cor-el
  • Top 10 Contributor
  • Moderator
17409 solutions 157269 answers

We have seen cases where a box with all '?' or all 'A' is displayed that might be related to using a Last Resort font that displays all the glyphs with one same character.

You can check in Font Book for font issues like corrupted and duplicate fonts.


See also;

We have seen cases where a box with all '?' or all 'A' is displayed that might be related to using a Last Resort font that displays all the glyphs with one same character. You can check in Font Book for font issues like corrupted and duplicate fonts. ---- See also; *[[/questions/1178053]] Firefox not displaying fonts correctly
jscher2000
  • Top 10 Contributor
8632 solutions 70604 answers

Chosen Solution

One other thing to check:

Firefox 56 ratcheted up the security sandbox, limiting which files pages can use on your system. This apparently prevents Firefox from using font files in a "suitcase" or "Adobe Type 1" format. You might have those same fonts in TrueType or OpenType format, but Firefox may not be seeing them for one reason or another.

As a temporary workaround, you can reduce the sandbox level back to what it was in Firefox 52-55 as follows:

(1) In a new tab, type or paste about:config in the address bar and press Return. Click the button accepting the risk.

(2) In the search box above the list, type or paste sand and pause while the list is filtered

(3) Double-click the security.sandbox.content.level preference and change the value from 3 to 1 and click OK

That change won't take effect until the next time you quit and restart Firefox.

Does that work on your Firefox?

One other thing to check: Firefox 56 ratcheted up the security sandbox, limiting which files pages can use on your system. This apparently prevents Firefox from using font files in a "suitcase" or "Adobe Type 1" format. You might have those same fonts in TrueType or OpenType format, but Firefox may not be seeing them for one reason or another. As a temporary workaround, you can reduce the sandbox level back to what it was in Firefox 52-55 as follows: (1) In a new tab, type or paste '''about:config''' in the address bar and press Return. Click the button accepting the risk. (2) In the search box above the list, type or paste '''sand''' and pause while the list is filtered (3) Double-click the '''security.sandbox.content.level''' preference and change the value from '''3''' to '''1''' and click OK That change won't take effect until the next time you quit and restart Firefox. Does that work on your Firefox?