You can install an XPI file (Firefox/Mozilla extension), by selecting the "File" menu and then selecting "Open File...", browsing for the XPI in question and clicking the "Open" button.
The program will open the file, realize it is an Firefox/Mozilla extension file, and go through the installation process.
I use this method to install XPI files quite often as I have found that the installation-from-web-just-by-clicking-on-the-XPI-file-link-on-the-webpage method to be flaky at best.
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"You looked at me as if I was eating runny eggs in slow motion." - Gord Downie of The Tragically Hip
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