The File Extensions Database

.WEBAPP File Extension

  • Developer by: Mozilla
  • Category: Data Files
  • Format: Text

What is an .WEBAPP file?

.WEBAPP is Firefox Web App Manifest File

Web app manifest file used by Firefox OS apps to identify important details of an app; contains information in JSON format about an app, which includes the name, developer, launch path, description, and icon(s); also contains a list of web APIs that the app requires.

Firefox OS is an open source mobile operating system developed by Mozilla. Firefox OS apps are similar to websites or web apps and are built with standard web technologies such as HTML, JavaScript, and CSS. They can be accessed through a web browser and can also be installed on devices for working offline.

The list of web APIs contained within the WEBAPP file allows you to make decisions about apps before installing them. WEBAPP files are necessary in order to publish an app to the Firefox Marketplace.

NOTE: You can scan your WEBAPP manifest file for correct formatting and appropriate values with the Mozilla Web App Validator.

Common WEBAPP Filenames

manifest.webapp - The naming convention used for web app manifest files used by the Firefox OS app. Placed in the root of the app directory.

Programs that open Firefox Web App Manifest File
Mozilla Web App Validator
Mozilla Web App Validator
Mozilla Web App Validator

How to solve problems with WEBAPP files

  • Associate the WEBAPP file extension with the correct application. On :
    Windows: Right click on any WEBAPP file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.WEBAPP files". Mac: Right click (or Ctrl-click) the WEBAPP file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .WEBAPP is Firefox Web App Manifest File. Because only the current version supports the latest WEBAPP file format. Search, therefore, e.g. on the Mozilla manufacturer website after an available .WEBAPP is Firefox Web App Manifest File update.
  • To make sure that your WEBAPP file is not corrupted or virus-infected, get the file again and scan it with antivirus software.