This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Why does Firefox set network.protocol-handler.expose.(protocol) to "true" on every start?

  • 2 cavab
  • 2 have this problem
  • 1 view
  • Last reply by cor-el

more options

I want to make FF open "file://"-links with the Windows Explorer. It works if I set "network.protocol-handler.expose.file" to false and "network.protocol-handler.external.file" to true. But "network.protocol-handler.expose.file" is missing in about:config after a restart. So i've set it in my user.js. Now I can see the variable but its always set to true no matter what stands in my user.js. Why is FF overriding my config?

I want to make FF open "file://"-links with the Windows Explorer. It works if I set "network.protocol-handler.expose.file" to false and "network.protocol-handler.external.file" to true. But "network.protocol-handler.expose.file" is missing in about:config after a restart. So i've set it in my user.js. Now I can see the variable but its always set to true no matter what stands in my user.js. Why is FF overriding my config?

Chosen solution

All Replies (2)

more options

Seçilmiş Həll

Try Locking preferences .


thank you

more options

That should be OK.

Firefox should store the protocol settings in the mimeTypes.rdf file.