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Setup defaults preferences for Adblock Plus data and patterns in prefs.js

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I'd like to distribute Firefox with some pre-installed preferences (including Adblock Plus settings) in my organization.

Fallowing preferences setup via prefs.js don't work:

   pref("extensions.adblockplus.data_directory", "\\\\" + getenv("USERDNSDOMAIN") + "\\App\\Firefox\\ESR\\adblockplus\\data\\")
   pref("extensions.adblockplus.patternsfile", "\\\\" + getenv("USERDNSDOMAIN") + "\\App\\Firefox\\ESR\\adblockplus\\patterns.ini");

Is Firefox allowing to use USERDNSDOMAIN or USERDOMAIN varibles in prefs.js? Is this syntax OK? Could someone help me to figure why it is not working?

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Athraithe ag guigs ar

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My problem has nothing to do with GPO, I did put my settings in CFG file.

As I describe in first post - I did set file and folder location for data and patterns of Adblock Plus in CFG file. AS long as I set absolute UNC path Adblock works fine, but as soon as I change path to use USERDOMAIN varible in path Adblock Plus can't find location of its files.

When I print USERDOMAIN varible in command line, it is displayed correctly. So I am almost sure it is something wrong with parsing config file by Firefox.

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You can't use getenv in a prefs.js file, but you can use it in a mozilla.cfg auto-configuration file.