To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!
CloseWelcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.
CloseReview for Open With by Kovil Pillai
Rated 5 out of 5 stars
I had the open_with_mac.py file under Downloads directory and spent hours on searching for a solution for the Test Installation failed error.
Finally moved the file under ~/Library/Application Support/Mozilla folder and it worked :)
To create your own collections, you must have a Mozilla Add-ons account.