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Font rendering gives some errors

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I just installed a fresh copy of Windows 11 and last Firefox, and get some weird rendering of letters on some websites. It seems that the end of a letter is bolded so to speak (screenshot attached). Also, there is an unnatural widening between the lines of text on the same websites (screenshot attached). This does not appear on other browsers. What can I do to correct it?

I just installed a fresh copy of Windows 11 and last Firefox, and get some weird rendering of letters on some websites. It seems that the end of a letter is bolded so to speak (screenshot attached). Also, there is an unnatural widening between the lines of text on the same websites (screenshot attached). This does not appear on other browsers. What can I do to correct it?
Captures d’écran jointes

Solution choisie

It didn't help. What helped is unchecking this: "Allow pages to choose their own fonts, instead of your selections above". Thanks anyway.

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In the Menu bar at the top of the screen, click Firefox and select Preferences. Click the menu button. In the General panel, go down to Language and Appearance. Under ColorsFonts, use the drop-down menus to select the font and font size of your choice. Close the about:preferences page.

Check if this helps, TG

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Solution choisie

It didn't help. What helped is unchecking this: "Allow pages to choose their own fonts, instead of your selections above". Thanks anyway.