I tried (and liked) a couple of suggestions from your tweak FF4 page.
In the UserChrome.CSS file . . .
/* Change Firefox button from orange to grey */
#appmenu-button {background: -moz-linear-gradient(rgba(0,0,0,.1), rgba(0,0,0,.1) 95%) !important;}
/* Remove the Bookmark Star */
#star-button {display: none !important;}
/* Make Inactive Tabs Transparent */
.tabbrowser-tabs tab:not([selected="true"]) {background-image: white !important; opacity:0.5;}
I'm used to the Context Menu order of the earlier versions. With Firefox 4, I was automatically clicking the second entry in the Context Menu and opening a new window instead of the new tab I wanted. Here's the entry in UserChrome.CSS that puts the Context Menu order of FF4 back to what it was in FF3.6
/* Switch first 2 context menu item positions */
#contentAreaContextMenu > * {-moz-box-ordinal-group: 2;}
#context-openlink {-moz-box-ordinal-group: 1 !important;}
Cheers, PW.