Using Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; pt-BR; rv:1.9) Gecko/2008051202 Firefox/3.0 {Note that I'm using pt-BR of Firefox 3 release candidate 1} Steps: 1. Bring up the Add-ons Manager 2. Search for "Pink Paula" 3. Returns "nothing found" 4. Click the "Exibir todos os resultados (2)" [See all results] 5. Takes you to a page on AMO with an encoded search %2520 in the URL, "https://addons.mozilla.org/pt-BR/firefox/search?q=pink%2520paula" Tried same steps in en-US version and it works OK and links to https://addons.mozilla.org/en-US/firefox/search?q=pink%20paula (but shows three results). CC'ing laura to see if this is perhaps an AMO API issue

Sounds like bug 434252?