[Originally posted by]: http://ccm.net/faq/14647-firefox-set-a-default-zoom-level-for-all-websites
[FireFox] Set a default zoom level for all websites
If you want to have the same zoom level for every visited website:
- Open Firefox.
- In the address bar type the following command:
- Click on the “I’ll be careful, I promise…” button
- In the Filter field type:browser.zoom.siteSpecific
- Double click and set its value to False.
- Close the about:config window and restart Firefox.