User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:18.0) Gecko/18.0 Firefox/18.0 Build ID: 20121028042012 Steps to reproduce: Step 1. Open the Developer Toolbar Step 2. Type "screenshot test" (with or w/o file extension) Step 3. Type one space Step 3. Start to type "true" or "false" or any letter Actual results: A tooltip appears: "Available Options\nToo many arguments" (see attachment).

My guess is that you're following Kevin's excellent introduction to the command line. Since Kevin made that video, we've updated the screenshot command to use optional parameters rather than positional parameters. If you type "--" you'll see a list of the available parameters. I'll see what we can do to annotate the video with a note that the format of the screenshot command has changed. Please re-open this if that doesn't help, and thanks for the report.

I use this useful command (and other developer tools) since its introduction in Firefox ;) But I did not follow the changes in syntax. In addition, it's never mentioned that you need to type "--" to view or use an optional argument. Thx for the clarification :)

(In reply to Mehdi Kabab from comment #2) > In addition, it's never mentioned that you need to type "--" to view or use > an optional argument. You're right, it's not immediately obvious. The hope was that putting [options] in the hint area (currently broken due to bug 800346 ): would give a clue, and that people might be used to typing -- to get options from experience with other command lines. I'll bare this in mind.