You want to choose the Replace the files in the destination option. You will then be prompted to replace the files in the destination, skip the files, or let you decide for each file.Open over 400 file formats with File Viewer Plus. Extracting the file's contents with a Zip compression utility, such as Corel WinZip (Windows, Mac), 7-Zip (Windows), or Apple Archive Utility (Mac).Since an XPI file is a Zip-compressed archive, you can manually extract and view its contents by:

How do I view an XPI file's contents outside Mozilla applications? In Windows, select the Menu (three horizontal lines) icon, click Add-ons, and then click Add-ons again.

To install an XPI file in Mozilla Thunderbird: How do I install an XPI file in Mozilla Thunderbird? The iOS version of Firefox does not allow users to install XPI files. On Android devices, you can install the add-on an XPI file contains by locating the file in an Android file manager (such as File Viewer Plus or ES File Explorer), tapping it, and opening it with Firefox. How do I install an XPI file in the mobile version of Firefox?

Click the Gear icon dropdown menu and select Install Add-on From File.

Select Extensions, Themes, or Plugins (depending on the type of add-on your XPI file contains).In Windows, select the Menu (three horizontal line) icon in Firefox's upper-right corner and click Add-ons.If dropping your XPI file onto Firefox does not work, you can manually install the file using the instructions below: Firefox then uses a component called XPInstall to install the add-on your XPI file contains. Some versions of Mozilla Firefox allow you to install an XPI file by dragging and dropping the file onto an open browser window.

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