LIBDBUSMENU-GTK-CRITICAL **: dbusmenu_menuitem_property_set_shortcut: assertion `gtk_accelerator_valid(key, modifier)' failed

This is because Firefox sets an accelerator on one of its menuitems which GTK doesn't consider valid (even though the accelerator works fine when Firefox draws its own menu). The menuitem is hidden by default though anyway, but I'm not sure what to do about this warning (other than changing default accelerators in Firefox to deviate from the upstream defaults, which I'd rather not do)

just upgraded to firefox 6 on natty, firefox crashes everytime I click on something on gmail or facebook...
launching firefox from terminal gives me this error :
LIBDBUSMENU-GTK-CRITICAL **: dbusmenu_menuitem_property_set_shortcut: assertion `gtk_accelerator_valid(key, modifier)' failed

this bug seems critical to me.

No, this bug is just a warning. If you're experiencing a crash, then it's totally unrelated to this.

you are right, the Load Tab Progressively addon was guilty in my case...

I experienced this on 11.10 Beta 1 live cd when Firefox was launched from `ubuntu-bug`.

This bug was fixed in the package firefox - 14.0~b8+build1-0ubuntu1

---------------
firefox (14.0~b8+build1-0ubuntu1) quantal; urgency=low

  * New upstream release from the beta channel (FIREFOX_14_0b8_BUILD1)

  * Update globalmenu-extension to 3.3 prerelease r369
    - Fix LP: #1010580 - No choice of folder when adding a bookmark from
      the bookmark menu
    - Fix LP: #775080 - Thunderbird with Firetray/MinimizeToTray -
      Global menu disappears
    - Fix LP: #813775 - Hitting an assertion in dbusmenu
    - Fix LP: #861565 - No buttons in the "Show All Bookmarks" dialog
 -- Chris Coulson <email address hidden> Wed, 20 Jun 2012 18:17:11 +0100

Thanks, It seems to be fixed...

I have the same bug here : (firefox:18412): LIBDBUSMENU-GTK-CRITICAL **: dbusmenu_menuitem_property_set_shortcut: assertion `gtk_accelerator_valid(key, modifier)' failed.

Firefox package version : 14.0.1+build1-0ubuntu0.12.04.1.

in Firefox package version: "21.0~b6+build1-0ubuntu0.13.04.1~mfn1" I have the same error :-/

I'm on Ubuntu 12.04 with Firefox 26.0 and I will have this bug.

While running firefox the terminal I get this output:

(firefox:15419): LIBDBUSMENU-GTK-CRITICAL **: dbusmenu_menuitem_property_set_shortcut: assertion `gtk_accelerator_valid(key, modifier)' failed

And the theme switches from black top bar to grey top bar and the text on the inactive tabs become unreadable. I use the default theme.

Before: http://i.imgur.com/lMgqVl8.png
After: http://i.imgur.com/KxrOQr7.png

I can still start firefox in private or save mode and get the normal black theme

Hey! Today I updated my system (Ubuntu 14.04 LTS) and this bug returned.
Is it possible to find out if the proposed solution would work for this new version of the bug?
Thank you in advance.

I have this error in the terminal when running Firefox 49 on Ubuntu 16.10.

Hello,

I have this message on Ubuntu Budgie 19.10 freshky installed + FF74.0

Same if launched in safe mode with no addons.

Same if I don't use any Budgie applets regarding app-menus ( ie. pixel-saver or global-menu )

See https://discourse.ubuntubudgie.org/t/firefox-in-19-10-is-kind-of-slow-to-start/3265

as this bug seems to slow down Firefox starting + tabs management.