You may have accidentally zoomed webpage(s).
Reset the page zoom on pages that cause problems.
- View -> Zoom -> Reset (Ctrl+0/Command+0 (zero))
Firefox has a Zoom section in Settings to set the default zoom level for webpages.
- Settings -> General -> Language and Appearance -> Zoom
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 on the about:config page 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 the about:config page via the location/address bar.
On the warning page, you can click "Accept the Risk and Continue" to open about:config.
You may have accidentally zoomed webpage(s).
Reset the page zoom on pages that cause problems.
*<b>View -> Zoom -> Reset</b> (Ctrl+0/Command+0 (zero))
*https://support.mozilla.org/en-US/kb/font-size-and-zoom-increase-size-of-web-pages
Firefox has a Zoom section in Settings to set the default zoom level for webpages.
*Settings -> General -> Language and Appearance -> Zoom
You can look at this thread:
*[/questions/1384204] Since the last update, the Firefox screen does not fit my system setting(125%)
<hr>
If setting <b>browser.display.os-zoom-behavior = 0</b> doesn't work for you then you can create a new <b>Number</b> pref on the <b>about:config</b> page and set its value to 100.
Paste <b>ui.textScaleFactor</b> in the search bar and select the <b>Number</b> 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 the <b>about:config</b> page via the location/address bar.
On the warning page, you can click "Accept the Risk and Continue" to open about:config.
*https://support.mozilla.org/en-US/kb/about-config-editor-firefox