Adblock Plus and (a little) more

Added welcome dialog that allows new users to add subscriptions easily
Preferences dialog: Made keyboard shortcuts for the filters list respect ui.key.accelKey preference

~~Preferences dialog: regexp mark sometimes fails to load (Gecko/XUL cache issue)~~

Toolbar icon’s tooltip shows number of blocked items and three most used filters for the current page
Toolbar icon changes when entering a whitelisted page

~~Preferences dialog: “Update subscription now” in the context menu stopped working~~
~~Preferences dialog: “Update subscription now” in the context menu should have keyboard shortcut Ctrl+T~~

Removed most of Gecko 1.7 compatibility code to increase performance and stability
Sidebar: Only cached images should be shown in the tooltip, no additional server requests

~~Preferences dialog: Flashing item borders stopped working when selecting an item from dropdown list~~
~~Preferences dialog: Trying to open context menu on the editor produces weird behavior~~
~~Preferences dialog: RegExp warning appears when editing a filter that was already a regular expression~~
~~Preferences dialog: Filter subscriptions cannot be disabled~~
~~Preferences dialog: Selecting Paste from menu while inline editor is open produces weird behavior~~

~~Preferences dialog: Crash when OK/Cancel is pressed while inline editor is open and regexp warning dialog is triggered~~
~~Preferences dialog: A single click on “Add filter” in the list should start the editor~~

Changed lower bounds for required browser versions: at least Firefox 1.5 and SeaMonkey 1.0 are required now. Netscape Browser and Mozilla Suite are not supported any more.
Started removing compatibility code for Gecko 1.7 to increase performance and stability