User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.8.1.12) Gecko/20080201 Firefox/2.0.0.12 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b3) Gecko/2008020514 Firefox/3.0b3 If you search for an addon with a space in for example 'Web Developer' the 'See all results' links leads to https://addons.mozilla.org/en-US/firefox/search?q=Web%2520Developer instead of https://addons.mozilla.org/en-US/firefox/search?q=Web+Developer The url is being escaped, but the website then doesn't support the unescaped space character, so either the website needs to support the way the add-ons sends the link or the url needs to not be escaped I guess. Reproducible: Always Steps to Reproduce: 1. Tools --> Add-Ons 2. Search for something with a space eg Web Developer 3. Click the 'See all results' link 4. https://addons.mozilla.org/en-US/firefox/search?q=Web%2520Developer opens but it needs to be blah/search?q=Web+Developer Actual Results: Wrong url opens. Expected Results: Either opened https://addons.mozilla.org/en-US/firefox/search?q=Web+Developer or the website allow for the url to be encoded.