Because I prefer to archive all software that I install, I download the
.xpi files for extensions and then install them from my local hard
drive.  Because I log the changes made when I install software, I
disable my Internet connection prior to doing the installation in order
to prevent extraneous changes to my system (e.g., resynchronization of
my clock, downloading of E-mail).

Today, I tried to install the 1.3.5 update to AdBlock Plus.  It failed
to install, with the message:
  SeaMonkey could not install the file at
  file:///D:/downloads/software/.......
  because: Signing could not be verified.
  -260

When I retried the installation with my Internet connection enabled, it
worked without any problems.

How can I install extensions and other add-ons without an Internet
connection?

Followup-to set to mozilla.dev.extensions.

-- 

David E. Ross
<http://www.rossde.com/>

On occasion, I might filter and ignore all newsgroup messages
posted through GoogleGroups via Google's G2/1.0 user agent
because of spam from that source.
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