Does Websites look wrong or appear differently than they should help at all?

Reset the page zoom on pages that cause problems.

• View > Zoom > Reset (Ctrl+0 (zero); Cmd+0 on Mac)

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

nope, all other pages are fine

thanks but didn't fix issue

Can you attach a screenshot?

• http://en.wikipedia.org/wiki/Screenshot
• https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem

Use a compressed image type like PNG or JPG to save the screenshot.

did it in PNG, hope you can view it......very odd---i reinstalled firefox a few times, did not help, but when i tried to uninstall 'including customizations' the uninstall locks up and i am forced to 'cntrl,alt,del and end program; it is uninstalled but leaves my customizations alone...also Odd!

also my IE does not have this issue....the firefox has never done this before...about the same time this happened i was trying to get a giftcard from walmart and had to click on several sales offers; they were not intrusive popups---(maybe no connection but it is when the problem occured

That is how the page is constructed.
Firefox doesn't use fit to screen.

You can use an extension to set a default font size and page zoom on web pages.

• Default FullZoom Level: https://addons.mozilla.org/firefox/addon/default-fullzoom-level/

hey, but until just the other day it was always to the edges of the screen; so there is something going on...

just got a update for the browser, to 15.0.0, and that fixed it. margins are back where they have always been. thanks for trying, just fyi was not imagined issue and may happen in future to others, so let them in on the secret