User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.8.0.10) Gecko/20070216 Firefox/1.5.0.10 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.8.0.10) Gecko/20070219 Firefox/2.0.0.2 This occurs after completing, say, a Google search: If I subsequently use the mouse to highlight part of the search phrase I wish to revise, upon clicking in the InputBox an Autocomplete dropdown opens displaying a (usually) single item--a duplicate of the current InputBox contents. If I then inadvertantly pass the mouse cursor over the Autocomplete dropdown, the item becomes highlighted. After typing the revision, pressing Enter erroneously selects the dropdown item, causing the the InputBox to revert to its previous state rather than performing the intended action (in this case a search on the revised phrase). This does NOT occur in Firefox 1.5.0.10. Reproducible: Always Steps to Reproduce: 1. Open http://www.google.com 2. Type an arbitrary search term and press ENTER 3. Replace the search term with (in double quotes) "mary had a little spam" 4. Press ENTER 5. Double-click on 'spam' in the results page InputBox 6. Move the mouse cursor "out of the way," passing it over the open dropdown 7. Type 'lamb' (changing the search phrase to read "mary had a little lamb") 8. Press ENTER 9. The InputBox text reverts to "mary had a little spam" and no search is performed Actual Results: The InputBox default action is NOT performed, and it reverts to the previous text. Expected Results: The InputBox default action is performed with the revised text preserved. I've picked on Google, but this behavior seems to be reproducible anywhere Autocomplete is active. Search engines just seem especially prone, since search criteria are frequently subject to such incremental revision. Conceivably, under certain situations, this behavior could pose a security risk by improperly passing cached personal or otherwise sensitive information to a site for which it was not intended, without the user noticing. Though I am constrained by time in exploring the veracity of such a hypothesis, I believe prudence warrants a severity of Critical.

Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US; rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3 This bug wreaks havoc on google search.

Reproduced in: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.4) Gecko/2007051502 Firefox/2.0.0.4 Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a6pre) Gecko/2007060204 Minefield/3.0a6pre