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Set preferences to use Adobe to open pdf files instead of builin viewer

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I am looking for a preference setting in one of the configuration files, preferably user.js, to tell Firefox to open pdf files using "Adobe acrobat (default)" rather than the built in viewer. I can do it through the user interface, but I need to push the setting to multiple users. I noticed that when I manually change the setting, pdfjs.enabledCache.state is changed from true to false. But that does not seem to be the only setting that changes.

I am looking for a preference setting in one of the configuration files, preferably user.js, to tell Firefox to open pdf files using "Adobe acrobat (default)" rather than the built in viewer. I can do it through the user interface, but I need to push the setting to multiple users. I noticed that when I manually change the setting, pdfjs.enabledCache.state is changed from true to false. But that does not seem to be the only setting that changes.

Chosen solution

See also:

DisableBuiltinPDFViewer:

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  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0

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jscher2000
  • Top 10 Contributor
8641 solutions 70690 answers

Hi tanyaj, this flag is stored in a file in the user's profile named handlers.json. I don't know whether there is a way to preset that, but there is a policy option to disable the built-in viewer, which might then cause the default application to be used.

More info on policy: Customizing Firefox Using Group Policy (Windows)

Meanwhile, I'll flag this thread as belonging under Firefox for Enterprise, which I think is more suited to the problem.

Hi tanyaj, this flag is stored in a file in the user's profile named '''handlers.json'''. I don't know whether there is a way to preset that, but there is a policy option to disable the built-in viewer, which might then cause the default application to be used. More info on policy: [[Customizing Firefox Using Group Policy (Windows)]] Meanwhile, I'll flag this thread as belonging under Firefox for Enterprise, which I think is more suited to the problem.

Modified by jscher2000

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Question owner

Jscher2000, thank you for your reply. I have tried disabling the built-in viewer. That causes the filed to be downloaded instead of opened in Adobe viewer.

Jscher2000, thank you for your reply. I have tried disabling the built-in viewer. That causes the filed to be downloaded instead of opened in Adobe viewer.
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cor-el
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  • Moderator
17423 solutions 157433 answers

Chosen Solution

See also:

DisableBuiltinPDFViewer:

See also: *[/questions/1257525] Write in handlers.json trough mozilla.cfg DisableBuiltinPDFViewer: * https://github.com/mozilla/policy-templates/blob/master/README.md
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Mike Kaply
  • Moderator
37 solutions 189 answers

> That causes the filed to be downloaded instead of opened in Adobe viewer.

Were they offered Adobe as a choice to open the file?

> That causes the filed to be downloaded instead of opened in Adobe viewer. Were they offered Adobe as a choice to open the file?
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