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Changing the font size of tabs and bookmarks bar

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Hello,

I was wondering if there is any way to increase the font size of the tabs and the bookmarks bar in Firefox. I'm using macOS Catalina, and the text appears tiny, making it very difficult to read.

I have found the following suggested fixes, but neither provides a satisfactory solution:

Theme Font & Size Changer: appears to have lost most of its functionality in the newer versions of Firefox.

'Changing the layout.css.devPixelsPerPx value in about:config: this does indeed scale the size of the tab and bookmarks text, however, I'm using two screens, and the scaling does not match between the two. When the font appears big enough on my attached screen, weirdly the font on my laptop screen becomes even smaller than at the default -1 value. And if I increased it to the right size on my laptop screen, it become ginormous on my attached screen (see attached screen shots).

Any solution to save my poor eyes from straining would be appreciated,

Best wishes,

Veronika

Attached screenshots

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