Is this only a problem with the location/address bar ?

Can you attach a screenshot?

• https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem
• use a compressed image type like PNG or JPG to save the screenshot

I have this same issue this morning! I received a notice to shut down my computer for updates to take effect. I did shut down last night and when I got on the computer this morning my explorer, desktop, the address/search bar in firefox, etc is way too small for me to work today! I can't see the text clearly! I work on the computer all day and this is critical for me to fix. Please help!

You can adjust display scaling in Windows settings.

You can look at this thread:

• /questions/1384204 Since the last update, the Firefox screen does not fit my system setting(125%)

If setting browser.display.os-zoom-behavior = 0 doesn't work for you then you can create a new Number pref in about:config and set its value to 100. Paste ui.textScaleFactor in the search bar and select the Number radio button and click the '+' button to add the new Number pref, enter the value (100) and click the blue OK button to confirm.

• about:config => ui.textScaleFactor = 100

You can open about:config via the location/address bar. On the warning page, click "Accept the Risk and Continue" to open about:config.

• https://support.mozilla.org/en-US/kb/about-config-editor-firefox