Today I was playing around with the keys in Firefox and I accidentally changed the font size on Firefox. The websites started looking funny as things were looking out of proportion.
Here’s the solution to revert back to the default font size on firefox, if in case you accidentally happen to change the the size of font, either increasing it or decreasing it.
Press Ctrl + 0 (here 0 is ‘zero’ and not the alphabet ‘O’).
If you want to increase the size of the font in Firefox, deliberately, then the keyboard shortcut for that is : Ctrl plus the + sign (plus sign on keyboard) and to reduce the size of the font in Firefox the keyboard shortcut is : Ctrl plus – sign (minus sign on keyboard).