How to make Firefox text/font appear bold and or bigger on all websites...

i was rly struggling with finding a solution to this dilemma i had, so here's how i solved it:

i was messing around with the fonts section in firefox's settings (Three horizontal bars on the top right corner> General> Scroll down until you see 'Fonts' then click 'Advanced')

Important! Please unselect 'Allow pages to choose their own fonts, instead of your selections above'

From there change Serif, Sans Serif, and Monospace all to the font Arial Black. Finally, mess around with the font size in 'Minimum font size' to set how large you want the letters to look when you're regularly browsing through Firefox.

I suggest you open up another Tab and test out the new set difference by searching anything to see how big the text is!

By the way, if you don't want the bold effect i'm sure you can just keep the fonts the same and just change the size. All up to you.

If this info has already been out there, posted or shared by some other individual, i would be pretty annoyed that i didn't get to see it myself before i had to go around and mess with those settings for like 5 mins.

i hope this helps someone else not waste too much time trying to figure this out.

(i fear this whole thing was me not using common sense but nevertheless i hope it's useful to someone in the future?)

Posted Mar 14, 2026, 12:25 AM UTC

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