User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b4pre) Gecko/2008022704 Minefield/3.0b4pre Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b4pre) Gecko/2008022704 Minefield/3.0b4pre Using the new "Get Adds-ons" feature, if the user types in spaces in the search and then clicks the "See all results" link, Firefox will open a tab and replace all the spaces with %2520 in the URL such that the actual search ends up replacing the spaces with %20. Reproducible: Always Steps to Reproduce: 1. In Get Add-ons, search for "tab list" (without quotes) 2. Click "See all results" Actual Results: A new tab opens with the URL "https://addons.mozilla.org/en-US/firefox/search?q=tab%2520list" which populates the search box on that page with "tab%20list". This finds no results. Expected Results: The tab should open the URL "https://addons.mozilla.org/en-US/firefox/search?q=tab%20list" which will populate the search box on that page with "tab list" and find results. This may affect other escaped characters, but I couldn't find any results when entering them.