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How do i download an add-on onto a flash drive for installation onto another computer?

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I want to download an add-on (Better Cache); specifically the "Better Cache". Can I download the add-on using this computer and save it on a flash drive , and then install it on another computer (using windows XP)?

I want to download an add-on (Better Cache); specifically the "Better Cache". Can I download the add-on using this computer and save it on a flash drive , and then install it on another computer (using windows XP)?

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Right-click the "Install" link and use Save Link As...

Then in the other version of Firefox use File > Open File... to install it, or drag the XPI file into the Firefox browser window.