My dock and top menu bar disappear when I am using Firefox

Just to help to anyone if it is a still issue.

The only way to sort it out without remove anything from your mac is this way:

1.In Finder right click on the Firefox app and select “Show Package Contents”

2. navigate to Contents and open “Info.plist” in TextEdit.

3. In this file, near the top, there should be a piece of text that says <dict>, underneath this add the following making sure all of the text is present.

<key>LSUIPresentationMode</key>

<integer>0</integer>

4. save that file

5. restart firefox

6. happy browsing again

cheers

You can also refresh Firefox on their site

https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings

Force Quitting Firefox and relaunching it worked for me. Thanks a lot - it was a pain but so easy to fix

This started happening to me the other day. I did the plist.info edit hack and that worked, but just for a day. Then it went back to no menu bar and dock the next morning. I then used the "Force Quit" method which worked fine. Then I started thinking about what might have caused it...I believe that it is tied to the fact that I was watching Netflix in full screen mode and closed the MacBook when my show was done...with Firefox still in Full Screen mode. I get to work the next morning, connect it up to my external monitors, open up my MacBook and Firefox is confused and I run into my menu bar/dock problem.

I have a feeling that if I exited full screen mode in Firefox BEFORE I close my computer, everything would be fine.

Does this possibly coincide with what other folks have seen?

BTW, the Force-Quit solution is quick and dirty...and Firefox comes right back with all your tabs. :-)

~/Library/Preferences/org.mozilla.firefox.plist delete this file

just an addition to any folks still having this problem, like me. i;ve adopted a makeshift solution, which is, if the menu bar and dock vanish, go to finder, force quit firefox and reopen, which solves the problem, until the next time, which in my case is intermittent enough for this solution to be OK. oh, and to get the dock back so as to force quit once firefox has disappeared it you just click on the screen, though once you click on firefox again it'll vanish.

This has happened to me before and it took me a long time to work it out.

But all you need to do is froce quit safari or any application that this is happening to and start the application again.

Hope it works.

SGosai

The file that I told you to delete will just get rid of the preferences, which could be the reason. I deleted the one that I had for chrome and it really sped up chrome but it erased the bookmarks.

If you don't want to erase the bookmarks you can just export them to safari or chrome. If you really don't want to delete the file you can just uninstall firefox then reinstall it.

SGosai:

This worked for me. Thank you so much for posting. The problem with FF just showed up this morning. Last night, I had to close down my Mac due to a panic freeze. I had been watching You Tube clips of the Oscars on FF when that happened. I wonder if this caused the problem to begin with.

I tried the plist fix posted by mcgregork but it didn't work for me. I deleted that later and then tried your fix, which did work.

Thanks! Worked for me. I'm not sure how other people ended up with this problem, but my mistake was leaving my laptop unattended for a few minutes while I left the room. My cat also started up a couple of applications, created a NeoOffice file and did some Googling. I'm pretty sure she didn't order anything online though.

...and thanks from yet another grateful victim for the <info.plist> file modification, saved me as well!

I'm on FF 25.0.1 (OSX 10.7.5), and I *never* had this problem before.

I might mention the following, for all intents and purposes:

just before I noticed the problem for the first time, I made a LONG screen recording of video playing on a site opened in FF with Quicktime (about 80 minutes!)

I have no idea how, but I'm pretty convinced there's a direct link between the two events...

Anyway, WARM THANKS to mcgregork again!!!

This solved my problem! Thank you!

And me - weird? ffox 12.0

Also how did you know that and how did ffox start behaving like that? 😕