The Firefox Page Zoom feature does a domain by domain level of saving the users preferred zoom level settings, there is no default Page Zoom level setting in Firefox.
https://support.mozilla.com/en-US/kb/Page+Zoom

If your problem is with all webpages, try the Default FullZoom Level extension:
https://addons.mozilla.org/en-US/firefox/addon/6965

Or the NoSquint extension:
https://addons.mozilla.org/en-US/firefox/addon/2592/

In IE it is page >text> small medium larger or largest , What is it in firefox?

Firefox allow any page zoom setting from 30% to over 1000% if necessary, so you get the page zoom as you like and not just a few settings like IE.

You can set custom zoom settings via prefs on the about:config page:

• http://kb.mozillazine.org/Zoom_text_of_web_pages

• http://kb.mozillazine.org/toolkit.zoomManager.zoomValues
• http://kb.mozillazine.org/zoom.minPercent
• http://kb.mozillazine.org/zoom.maxPercent