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IMPORTANT: This pull request only fixes the problem #431.
I've submitted #439 that is based on this commit but also includes performance improvements for the shift+click range selection. I'll leave which one you want to merge at your discretion, just reject the other one.
-> See https://bugzilla.mozilla.org/show_bug.cgi?id=559506
-> Removed the javascript:void(0) href for anchor elements in the multiselect dropdown
-> Added a tabindex = 0 to keep the anchors focus-able
-> Added code to remove any text selection when using shift+click
-> Handles the checkbox selection manually when done using shift+click on its label