This probably belongs more into Core->Selection, that's why I'm filing it in there, but you can see it with the Find toolbar. To reproduce: - Just search for a word or text with the find toolbar, that can be found on this page and then click on "Highlight all". - Then try to select something from inside the yellow area of one of the found items. Note that the highlighted text still can be selected from outside the highlighted area.
Same with Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1a2pre) Gecko/20080819020844 Minefield/3.1a2pre ID:20080819020844
Double-clicking and triple-clicking in the highlighted area seems to work all right, so it's only an issue for drag-selection.
Created attachment 334566 [details] [diff] [review] Trivial fix
Verified fixed, using: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1b1pre) Gecko/20080908091724 Minefield/3.1b1pre