Lasereth: let's see what you think of these.
1. There are some tweaks, described in
this Mozillazine thread, that discuss various ways of tweaking the way image loading and other elements of reflowing as a page is loaded are handled.
2. Tabbed Browsing Extension (TBE) has the ability to permanently set favicons to bookmarks. However, the current build of TBE is completely fucked. It should work in the future for you, however.
3. No, the toolbar folder is stuck there. That annoyed me at first, but I don't mind anymore.
4. This requires a deep setting; type 'about
:config' into your address bar (there isn't a space between 'about
:' and 'config', but the board seems to want one there). Set the "mousewheel.withnokey.sysnumlines" pref to false and change the "mousewheel.withnokey.numlines" to a suitable number of lines. There is also a "general.smoothScroll" pref you can set to true to make the scrolling be smoother. More information, and a suggested extension if you wish,
in this Mozillazine thread.