Rated 5 out of 5 stars
There is a crude but quick fix for the changing toolbar size problem, the one PJatPoole or ShadowBrite referred to. Here it is:
Find the pagezipper folder within the profile folder of firefox: For instance:
"C:\Documents and Settings\username\Application Data\Mozilla\Firefox\Profiles\kw35ermz.default\extensions\email@example.com\skin"
Copy zipper_16.png and zipper_16_green.png over zipper_24.png and zipper_24_green.png respectively. This prevents pagezipper from enlarging the toolbar once you click on its button.