On October 9 of this year, the next version of the Firefox browser will be released with very interesting functionality - the command line, which, of course, will be of interest primarily to web developers.
The command line appears when you press the Shift-F2 key combination and has a system for adding commands and their parameters; also did not forget about the detailed tips. The range of tasks that can be solved from the command line is quite wide - from managing the content of a web page and its various analysis to creating screenshots of individual segments of a page, which can be determined, so to speak, “from the inside” - directly by tags. A video demonstration of the operation of the new tool is shown in the video below:
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Firefox 16 is currently available as a beta version here .