RFE: Add ability to have profiles save/set visibility of toolbar, tabs, bookmarks bar

I was just getting ready to do a video recording, and was wanting to have a preset which turned off the tabs, address bar and bookmarks bar (if possible) to show the browser with absolute minimum widgets on the window (similar to doing F11, but at a resolution other than fullscreen, to allow for viewing on lower resolution devices). Any chance of this being added? It would be so great to be able to do a key combo of say "Ctrl-Down 5" and end up at 1024x768 for the browser with all the other stuff hidden..

Thanks!