Sometimes the font size in the browser may have increased or decreased to the point where using the site is difficult. You can adjust the zoom level of the browser window by using the Ctrl + Plus(+) or Ctrl + Minus(-) key combination. Zooming is a browser feature, and the principle works similarly in Mozilla Firefox and Chrome.
If the font size is too small, press and hold the Ctrl key on the keyboard and simultaneously tap the Plus(+) key as many times as needed until the view is a suitable size.
If the font size is too large or the page does not fit on the screen, press and hold the Ctrl key on the keyboard and simultaneously tap the Minus(-) key.
Mozilla Firefox: Default PDF reader zoom level
1. Open the browser
2. Type the following address: about:config
3. Accept:
4. Type pdfjs.defaultZoomValue into the search field:
5. Click the pencil icon
6. Enter your desired default value (e.g., for 100%, type 100) and click the white checkmark on the blue background.