User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0 Build ID: 20140831201947 Steps to reproduce: 1. Make sure the you have at least two debug-able addon installed 2. Make sure you have addon debugging allowed (settings of Developer tools) 3. Open about:addons 4. Click 'Debug' on arbitrary addon, confirm in following dialog 5. Click 'Debug' on different addon Actual results: Nothing visible to regular user. Browser console (shell) output: DBG-SERVER: Could not start debugging listener on '6080': [Exception... "Component returned failure code: 0x804b0036 (NS_ERROR_SOCKET_ADDRESS_IN_USE) [nsIServerSocket.initSpecialConnection]" nsresult: "0x804b0036 (NS_ERROR_SOCKET_ADDRESS_IN_USE)" location: "JS frame :: resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/devtools/server/main.js :: DS_openListener :: line 463" data: no] Expected results: Either a new debugger should be open or user should be notified that such action (concurrent debugging) is not possible.
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