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[Jesse Johnson <holocronweaver@xxxxxxxxx>]

@radiobuzzer

"Lately the unity menu integration does not come as an addon. So, the
previous solution (to disable the globalmenu addon if ones has high CPU
load) does not work."

The addon, "Unity Desktop Integration", is still present in Ubuntu
13.04, and probably will continue to be in some form for the foreseeable
future.  Without a Firefox addon Unity has no means of using a simple
API to access the bookmarks, so it is highly unlikely the addon will be
replaced with some non-addon based interface.  Perhaps you manually
removed the addon via the package manager?

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https://bugs.launchpad.net/bugs/968533

Title:
  Alt-tab to Firefox sends Firefox to 100% CPU; unity-panel-service to
  80% CPU and hud-service to 20-80% CPU

Status in Unity:
  Confirmed
Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  I've been seeing UI hangs after switching tabs in Firefox, and
  switching from other applications to Firefox.

  It can take 3-8 seconds to change *tab*.  During this time the CPU is
  maxed out;  typical output from 'top' during this period shows 'hud-
  service' and 'unity-panel-service' combined using about the same CPU
  as Firefox itself:

   100 10.4  26:07.73 firefox            
    53  0.6   6:14.86 hud-service        
    38  1.5   6:42.14 unity-panel-service

  I suspect that the change is causing a (an inefficient) re-index
  related to updated menu structures.  (Eg. something like the history
  menu, although I can't see what it is as don't currently have a menu
  bar).

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