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Bad rendering fonts on page https://www.mdbg.net

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  • Last reply by Mrtvola

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I have problem with site https://www.mdbg.net if I use webpage fonts. This problem is only on MacOS version. Windows version don't have any problem. I use Firefox version 93.0

I have problem with site https://www.mdbg.net if I use webpage fonts. This problem is only on MacOS version. Windows version don't have any problem. I use Firefox version 93.0
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We have seen reports that this can be caused by a problem with fonts like Helvetica you have installed locally and that might be corrupted or are missing variants. Also make sure you allow pages to choose their own fonts and that you do not block remote (downloadable) fonts.


You can right-click and select "Inspect Element" to open the built-in Inspector with this element selected.

You can check in the Rules tab in the right panel in the Inspector what font-family is used for selected text. You can check in the Font tab in the right panel in the Inspector what font is actually used because Firefox might be using a different font than specified by the website.

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Chosen Solution

We have seen reports that this can be caused by a problem with fonts like Helvetica you have installed locally and that might be corrupted or are missing variants. Also make sure you allow pages to choose their own fonts and that you do not block remote (downloadable) fonts.


You can right-click and select "Inspect Element" to open the built-in Inspector with this element selected.

You can check in the Rules tab in the right panel in the Inspector what font-family is used for selected text. You can check in the Font tab in the right panel in the Inspector what font is actually used because Firefox might be using a different font than specified by the website.

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It was problem with fonts in system MacOS. I fixed it in Font Book. I removed duplicate fonts in type Helvetica.

Thank you very much for your quick help.