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Is there a convenient way to examine the source code for a Firefox extension before installing it?

(There is a Chrome extension that offers this functionality, though I have not used it, and cannot say how well it works. At any rate, I am interested primarily in Firefox extensions.)

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As Wladimir pointed out the .xpi file is simply a ZIP archive put together in a particular way. Open it with WinRAR, 7-zip or rename it to .zip and open it with your OS's default tool.

To get ahold of the .xpi file use https://addons.mozilla.org instead of the built-in extension manager. From there you can right-click on the install button and choose Save as...

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