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All of a sudden, after waking my computer from sleep, I found that many websites in Firefox are displaying the main text content at 13px, ignoring font sizes specified in CSS etc. I first discovered this on my organization's website, I thought it was a browser cache issue, but it has persisted. The text content on our front page is all the correct size, but everything on the website that is "main content" text that is not in a heading tag, like blog post or regular page content, is rendered at 13px. Other sites like Wikipedia load this way as well. In private mode, the issue disappears. In Chrome, the issue does not occur.

I have cleared all cookies, browser cache, site data, history, and the problem persists. I have checked the default font settings in Firefox, the checkbox saying websites should override the font settings is already checked. Zoom is set to 100%. I updated to the latest version in the course of restarting, and it didn't fix the issue either.

In the attached screenshot, the examples on the left are in regular Firefox windows. On the top right, a page on our site is displayed correctly in Firefox private mode. In the bottom right, Wikipedia is displayed correctly in Google Chrome.

Today, I noticed that fonts on sites look different than normal. At first I noticed that font looked smaller, but zoom is set to actual size. Then I noticed that while on a site with a black background the text was displaying as black also, making it impossible to read. I looked through the preferences and everything pertaining to fonts and colors appears to still be set to default. Next thing I tried was opening the same site in private window. While in the private window, the font and color appears as it should.

Any ideas how to fix this?

Hi all,

Had my text font changed all of a sudden. I'm not sure if I've accidentally pressed a shortcut to change any setting.

Image attached also show that this change has caused some misaligned numbers on a browser.

Is there a way to revert text to my previous settings?