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Too-tiny type after monitor upgrade

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I recently got a large (30") 4k monitor because I have been having trouble reading text. But Firefox has become practically unusable.

Some sites display with giant text, and I have to press ctrl-minus several times to fit them on the screen.

Meanwhile, the text in the Bookmarks bar, tabs, and URL window are unreadably small.

I tried about:config and layout.css.devPixelsPerPx, which currently seems to have a NEGATIVE value of -1.5. Per directions, I changed it to 1.5. NOTHING. NO CHANGE.

Then I found an endless series of possible fixes, all involving similarly opaque and obscure and user-unfriendly steps.

I might have to abandon Firefox, after all these years, over this. Anybody got a simple fix?

(I now see that I'm actually having the same problem in Windows Explorer, so maybe that's where I need to go to fix this.)

Thanks!

I recently got a large (30") 4k monitor because I have been having trouble reading text. But Firefox has become practically unusable. Some sites display with giant text, and I have to press ctrl-minus several times to fit them on the screen. Meanwhile, the text in the Bookmarks bar, tabs, and URL window are unreadably small. I tried about:config and layout.css.devPixelsPerPx, which currently seems to have a NEGATIVE value of -1.5. Per directions, I changed it to 1.5. NOTHING. NO CHANGE. Then I found an endless series of possible fixes, all involving similarly opaque and obscure and user-unfriendly steps. I might have to abandon Firefox, after all these years, over this. Anybody got a simple fix? (I now see that I'm actually having the same problem in Windows Explorer, so maybe that's where I need to go to fix this.) Thanks!
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