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I have two versions of Firefox installed:

  • version 16.0.1 in c:\Program Files\Mozilla Firefox
  • version 3.6.10 in c:\Program Files\Mozilla Firefox 3.6.10

In the registry, the key HKEY_CLASSER_ROOT\http\shell\open\command has this value:
"C:\Program Files\Mozilla Firefox\firefox.exe" -osint -url "%1"

However, all links are being opened in Firefox 3.6.10 not in 16.0.1. How to change the version of Firefox which is used to open http links?

Windows XP SP3

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2 Answers 2

Open Firefox 16.0.1 and go to Firefox button -> Options -> Advanced tab -> General tab -> Click "Make Firefox the default browser" button.

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This does not change version of Firefox used as the default browser. –  Piotr Dobrogost Oct 27 '12 at 10:02

You need to change a couple of keys.

Read this for detailed info: http://www.tomshardware.com/forum/170215-46-default-browser-registry

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