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Mozilla Firefox doesn't display cyrillic font on my PC

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Hey! I've noticed that a few Mozilla updates before I can't see cyrillic texts on some websites on my PC. I have been waiting for new updates to fix this problem but I can't wait anymore, cause I always have to go to another browser to read the website I need.

Hey! I've noticed that a few Mozilla updates before I can't see cyrillic texts on some websites on my PC. I have been waiting for new updates to fix this problem but I can't wait anymore, cause I always have to go to another browser to read the website I need.
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This looks like a problem with a corrupted or otherwise not working Helvetica font.

You can right-click and select "Inspect Element" to open the builtin 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.