It is impossible to select (by double clicking) either the first or last word in a line of text of a content editable hyperlink if the "element" that precedes or proceeds it, respectively, is not a grammatically correct sentence (i.e. ends in a punctuation mark) or another HTML element.
Created attachment 48048 [details] Test Case
Created attachment 48049 [details] Workaround with test case
*** This bug has been marked as a duplicate of bug 36360 ***