Sorry it's taken me a while to get to this. But I don't understand the problem: the UI for the devtools in Linux is almost exactly the same as the UI for the devtools in Windows or Mac OS X. While it's true that most of the screenshots and videos are taken from OS X, they would look almost exactly the same on other platforms. Where there are differences (for example, keyboard shortcuts) we try to document them. I've attached a screenshot of the debugger paused at a breakpoint in Ubuntu (Firefox 40/Ubuntu 12). You can see, it looks just like the screenshot on MDN. Could you attach a screenshot of what you are seeing? What do you see when you follow the instructions to open the debugger  (I've just tried to clarify these.) One possible clue is: you refer to the "Developer Toolbar". But this is not the debugger: it's a different tool, that gives you a command line interface to various devtools.  https://developer.mozilla.org/en-US/docs/Tools/Debugger/How_to/Open_the_debugger  https://developer.mozilla.org/en-US/docs/Tools/GCLI.
Status: UNCONFIRMED → RESOLVED
Last Resolved: 2 years ago
Resolution: --- → WORKSFORME
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