I currently use Remember The Milk and have a bookmark for my task list set to open in the sidebar (as described here). I don't typically have my bookmarks toolbar displayed in Firefox (same with the menu toolbar, to save space), so anytime I want to open my task list, I have to right click in the tiny space above the navigation toolbar, click on "Bookmarks Toolbar", and then click the bookmark. Is there an easier way to accomplish this? A keyboard shortcut would be ideal. Is it possible to do something with AutoHotKey to make this possible?
Ctrl-B will open your bookmarks in the sidebar. You can then tab into the bookmarks list and select Remember The Milk. Probably still more steps than you want but might help a little bit.
Take advantage of Awesome Bar in Firefox.
If you remember some words of the bookmark you are looking for, just type them in the URL place. It should suggest you the bookmark you want in the drop down list, then just click or use keyboard up/down+enter to select the bookmark you want.