Sorry, for poor German writing capabilities, so I'll reply in English.
You can try the following.
Create a file called
local-settings.js
It should contain at least the following:
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pref("general.config.obscure_value", 0); // not sure if this is really needed, but I have it in my config
pref("general.config.filename", "mozilla.cfg");
Create a file called mozilla.cfg
It should contain at least the following:
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pref("extensions.autoDisableScopes", 0);
pref("extensions.enabledScopes", 15);
download your *.xpi extension(s) and unpack them to separate folders with a compression program (I use 7-zip)
each unpacked folder should contain a file called install.rdf, open it with a texteditor and grab the top-most guid (including the curly brackets).
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<?xml version="1.0"?>
<RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:em="http://www.mozilla.org/2004/em-rdf#">
<Description about="urn:mozilla:install-manifest">
<em:id>{543b3a01-7ab2-13d4-5e02-004008928ae5}</em:id>
<em:version>1.7</em:version>
<em:type>2</em:type> <!-- type = extension -->
<em:unpack>true</em:unpack>
<!-- Target Applications this extension can install into,
with minimum and maximum supported versions. -->
<em:targetApplication>
<Description>
<!-- Thunderbird -->
<em:id>{2110f702-f582-3d05-4a08-321d09bdfdc6}</em:id>
<em:minVersion>24.0</em:minVersion>
<em:maxVersion>34.0</em:maxVersion>
<em:type>2</em:type> <!-- type = extension -->
<em:unpack>true</em:unpack>
In this example the guid is
{543b3a01-7ab2-13d4-5e02-004008928ae5}
rename the unpacked folder to this guid.
Now you silently install firefox and after install copy everything to the firefox program dir as follows:
installdir == c:\program files\Mozilla\firefox
local-settings.js ==> installdir\defaults\pref
mozilla.cfg ==> installdir
unpacked extensiondir(s) ==> installdir\extensions
so ultimately is should look something like this:
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c:\program files\Mozilla\firefox\
firefox.exe
mozilla.cfg
defaults\pref\local-settings.js
extensions\{543b3a01-7ab2-13d4-5e02-004008928ae5}