问题
According to this link, it should. But my Responsive Design Mode seems to be from before version 52, even though Firefox says it's version "53.0 (64-bit)"
回答1:
I had this problem and although the other answers were somewhat helpful, they didn't really solve this for me. After doing additional research, this is what I found what I had to do:
- Open about:config in your address bar.
- In the search bar, type browser.tabs.remote.autostart
- Double-click on this to change the value to true. If it was already set to true, no need to make any changes.
- Right-click anywhere on the list and from the drop-down menu, choose new -> boolean
- Name this 'browser.tabs.remote.force-enable'
- Set its value to true.
- In the search bar, type accessibility.force_disabled
- If it is present and the value is 0, set it to 1.
- Restart the browser
The device bar should now be present. Like so:
Credit goes to this page
回答2:
At the very top of the link you posted, there's this yellow box:
This page describes Responsive Design Mode as it appears in Firefox 52 and above. To see what it's like in earlier versions of Firefox, see Responsive Design Mode (before Firefox 52). This version of Responsive Design Mode also requires multi-process support (e10s) to be enabled in Firefox. If multi-process support is disabled, you'll see the old Responsive Design Mode instead.
If you're seeing the old responsive design mode, then probably you have e10s turned off. To check if that's the case, open the about:support page and check for the Multiprocess Windows entry. It will tell you if e10s is enabled or disabled and, if the latter, why.
回答3:
Go to mozilla firefox 'options' check 'Multiprocess Windows' and restart. you are done.
回答4:
Addition of the comment from @Dexter; to enable the multi-process support (e10s) do the step from the @Jahmic step 1-3 and restart the firefox. In my FF, there are 3 of them:
browser.tabs.remote.autostart
browser.tabs.remote.autostart.1
browser.tabs.remote.autostart.2
and I enable all of that. It is works for me (device option would appeared)
来源：https://stackoverflow.com/questions/43643795/mozilla-firefox-ver-53-doesnt-show-device-option-in-responsive-design-mode