Run multiple versions of Firexfox simultaneously
Generally it is not possible to run two versions of Firefox. So we have an alternate method to make it possible. You may follow these following steps for this : Install any version of Firefox (Portable Edition) apart from the pre-installed Firefox. Close all instances of Firefox Portable. Copy FirefoxPortable\Other\Source\FirefoxPortable.ini to FirefoxPortable (next to FirefoxPortable.exe)
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