Extension source viewer

This Opera extension adds a button to right of the omnibox when a CRX file or Firefox addon has been detected.
By default, this is only enabled on the Chrome Web Store, the Opera addon gallery and Firefox addon gallery. Upon clicking the button, three actions
become available:

- Download extension as zip file
- View source
- Install extension

The default action (showing the above options) can be changed via the "Primary action on click" menu that appears when you right-click on the extension button.

The "View source" option opens a new tab with a simple viewer, with the following features:

- Download-as-zip and download-as-crx at the upper-right corner.
- List of file names, and the option to filter files with a regular expression.
- Find files containing a string, or with content matching a regular expression.
- Quickly jump between search results, or from/to a specific line.
- Automatic beautification (formatting) of code
- Syntax highlighting
- Image preview
- Show hashes (md5, sha1, sha256, sha384, sha512) of the file content.
- View content of embedded zip files.
- Download Chrome Web Store extensions for a different platform (e.g. Chrome OS or NaCl).
- View the contents of any URL or zip file.
- Permalink to file and search result within a zip or extension file.

It is also possible to view the source code of Chrome, Opera 15+ and Firefox extensions that are hosted elsewhere. Further, there is an option to show a contextmenu entry on links whose target is a Chromium extension. Both features can be toggled at the options page.

Online demo with similar functionality: https://robwu.nl/crxviewer/