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Firefox 32bit shortcut opens in 64bit browser if already running

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I need both 32bit and 64bit versions of firefox on Windows 7 system. Some desktop shortcut links MUST open in OLDER 32bit version but if the 64bit version is already running it just opens the link in a new tab instead of 32bit version. Is there a command line option to disable this unwanted behaviour?

Thanks.

I need both 32bit and 64bit versions of firefox on Windows 7 system. Some desktop shortcut links MUST open in OLDER 32bit version but if the 64bit version is already running it just opens the link in a new tab instead of 32bit version. Is there a command line option to disable this unwanted behaviour? Thanks.

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