In my gmail, I inadvertently clicked somewhere , now the font size has become bigger on all mail. How can I bring it down to its original size?
First, please update to Firefox 19. Update Firefox to the latest version
Then, Read Websites look wrong or appear differently than they should
how do i update to firefox 19
If you read Update Firefox to the latest version it will describe how to update. This is important and it fixes many critical security issues and bugs.
You can find the latest Firefox 19.0.x release in all languages and for all Operating Systems here: