WebSocket Monitor 0.3.2

You need custom Firefox build with patches from bug 1203802 applied. You might want to download try build

• The Web Sockets panel displays a warning if the required frame web socket service isn't available
• Support for tabular and list perspectives. Two different ways how frames can be displayed. See a button in the toolbar.
• There is a new extensions.websocketmonitor.tabularView preference that stores the current perspective.
• The side bar is also cleared if the user presses the Clear button.
• Frame summary displayed at the bottom of frames respects the current filter
• The Web Socket panel has a new icon.

The extension isn't signed, so you might need to set xpinstall.signatures.required pref to false. You might also want to checkout a simple online test page