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Home/ Questions/Q 332221
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Editorial Team
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Editorial Team
Asked: May 12, 20262026-05-12T09:50:50+00:00 2026-05-12T09:50:50+00:00

I have followed the instructions here [MDC – Adding Extensions using the Windows Registry],

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I have followed the instructions here [MDC – Adding Extensions using the Windows Registry],
but haven’t been able to get Firefox to automatically install my extension when I restart it.

I have written an application that is half windows service and half FF extension. I have built an installer and want it to be able to install the Firefox extension along with the service.

So far I have tried the following things:

  • Removing my dev version of the
    extension from FF first
  • Removing the
    pointer file to my dev version of the
    extension from my profile dir
  • Removing my “dev” profile completelly
    so that FF only has a “default”
    profile
  • Running FF without the
    -no-remote and -P switches I setup for the dev environment
  • Trying the
    key in both HKEY_CURRENT_USER and
    HKEY_LOCAL_MACHINE
  • Carefully checking
    the ID and Paths I have used
  • Trying
    Paths that don’t include spaces
  • Trying the Paths in Quotes
  • Trying a
    trailing \ at the end of the path
  • Trying the .xpi filename at the end of the path instead of just the dir name
  • Building the XPI using the Extension
    Builder plugin instead of manually
    (although my manual build would
    install just fine if I dragged it to
    FF)

I’m using FF3.5.2 on Windows 2003 Server
(could it be a W2K3 install security issue?)

UPDATE: Now tested also on WinXP FF3.0.11. Same problem.

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1 Answer

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  1. Editorial Team
    Editorial Team
    2026-05-12T09:50:50+00:00Added an answer on May 12, 2026 at 9:50 am

    OK. I figured it out myself! I miss-read one line of the instructions!!!

    “the location of the unpacked XPI”

    I must be losing my mind. For some reason I reread this as the “packed XPI” over and over!!!
    (I feel very silly now)

    The answer was to use the unpacked files in the install dir not the .xpi file.

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