XPI File Extension

XPI file icon
Mozilla Installer Package
  • Developer
  • Popularity
    4.3 (22 votes)

What is XPI file?

File with XPI extension contains a data archive for installation of additional Mozilla software. The installation package is an uncompressed archive or a ZIP archive compressed using ‘deflate’ method. XPI extension name is short for Cross-Platform Install – XPInstall, which is the name of the technology used in ithe nstallation process. Sometimes it is referred to as ‘zippy’. XPI packages are used for installing adding new features and extending functionality of such software applications as:

  • Firefox,
  • SeaMonkey,
  • Thunderbird.

XPI package file can contain plugins, extensions, themes, or dictionaries. The file also stores installation instructions saved in script file install.js and a manifest file install.rdf. The software is a JAR package file. XPI file may also contains image of multimedia files used by given applications. XPI packages for Firefoxa can be creted usind SDK Add-on library. Standard Firefox installation installing only XPI files digitally signed by Mozilla. User just needs to drag and drop the XPI to web browser’s widow to download the package and after it has been downloaded, open the menu ‘Tools’ — ‘Add-ons / Extensions / Themes’. If user wants to install third-party packages not certified by Mozilla, they must use developer version of Firefox and set in about:config page option xpinstall.signatures.required to false. Contents of XPI package can be browsed by changing file’s extension into ZIP and unpacking it.

We hope we helped you solve the problem with the XPI file. If you do not know where you can download the application from our list, click on the link (which is the name of the program) - you will find more information there on the location where to download the secure setup version of the required application.

What else may cause problems?

There can be more reasons which determine that you are not able to open the XPI file (apart from the lack of the proper application installed).

First - the XPI file may be incorrectly associated with the application installed to support it. In this case, you need to change this association by yourself. To do this, right-click on the XPI file that you want to edit, click "Open with" and then select the program from the list that you have installed. After this operation, the problems with opening the XPI file should be solved.

Second - the file you want to open can simply be damaged. Then, the best solution is to find a new version of given file, or download it again from the same source as before (maybe for some reason in the previous session the download of the XPI file has not been completed and it cannot be opened properly).

Do you want to help?

If you have additional information about the XPI file, we will be grateful if you share it with our users. To do this, use the form here and send us your information on XPI file.

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