1. Go to: Tools > Options > General. Click on the 'Fonts and Colors' button. Where it says 'Minimum font size' try setting the font to 11. This should get it looking something like the font size you see in Internet Explorer.
Not 343 but 344. dome that and it's working fine now.
3. Is it scrolling with the mouse-wheel that you find won't work? This should be OK but with Firefox you have to left-click on the page you want to scroll first.
Java has to be installed separately in Firefox too, so do the Shockwave and Flash players. These are used for animations etc. Sooner or later a site being visited will say it needs them for the page contents to be displayed properly.
You can find them here: https://addons.update.mozilla.org/plugins/ There's a few other things there too but you might want to wait until they are required before installing them.
I've checked some of the other extension etc. and found this 'funny' tool.. Stumbleupon. Great tool to discovers web sites you otherwise would never 'stumble' upon. no7 from top