13

I'm not talking of the Print Preview - I mean to view the webpage in Firefox "normally", with access to e.g. the F12 Developer Tools, but I want the layout to be the same as if I was printing the page out.

15

Devtools Screenshot with a nice and friendly ponting arrow

There is now (June 2019) a nice button in the devtools. See this discussion mentioned in the answer by @interDist above.

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  • This solved my problem - the new button was hidden because my style pane was too narrow. Following your screenshot, I widened my pane and got a live print media preview. – Qsigma Jul 23 '19 at 13:50
9

From https://developer.mozilla.org/pl/docs/Tools/GCLI : Launch the Developer Toolbar with Shift+F2, then type: media emulate print

Somehow it doesn't solve my problem though, this what I see after this command differs from the Print Preview and from what is printed out... :(

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9

As of September 2018, no, there is no such option. The Developer Toolbar, mentioned by @gaazkam, was removed in Firefox 62 in September 2018. There is no replacement for the media emulate command in DevTools, although it may be given some priority now that the command line interface is gone. Discussion is also here: https://discourse.mozilla.org/t/how-to-media-emulate-print-without-developer-toolbar-gcli/30975.

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  • This appears to be a comment on the existing answer. – Blackwood Sep 18 '18 at 13:09
  • Actually, this is the correct answer for 2018. – zmbq Sep 21 '18 at 20:40
  • The way I do it, is open the site, go to print, then you can right click on elements and use "Inspect element". Chrome you can do the same. I know it's not what OP originally wanted, but just a work around for now. – user2924019 Oct 16 '18 at 16:14
  • doing it this way @user2924019 there are no css rules shown – Hayden Thring Nov 8 '18 at 4:55
  • 1
    Reading in 2019? There's an icon top-right in DevTools, looks like a page with one corner folded over. See Alexander Rutz's answer. – William Turrell Nov 25 '19 at 15:05

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