Trop compliqué à installer

Great extension, you need to install Python for it to work though. I use it to open Internet Explorer, Waterfox and videos in PotPlayer. A definite must have addon.

Excellent addon, I use with mpv (various settings like mpv.exe --ytdl-raw-options=format="bestvideo[height<=?1080]+bestaudio/best" to avoid 4K that my internet doesn't handle, mpv.exe --ytdl-raw-options=format=bestaudio for audio only),
to download videos with the help of youtube-dl and a bat file (can be done without a bat, I download both bestvideo and best),
to test pages on ESR (firefox.exe -profile "path\to\ESR\profile" -no-remote) or Chromium or Opera,
to use pre-Quantum addons like DownthemAll or HDS/HLS link detector on 56.0.2,
and more.
Very handy, highly recommended.

A suggestion:
Easy backup/restore entries option

It works well.
This extension should be renamed to something more appropriate like "Open url with..." because it can work with anything you put there not just browsers.
I use it not for browsers but to open links with MPV media player (youtube links mainly).

Useful and works well once configured.
A simple executable script to handle the installation might be useful.

BTW, what's up with the latest update? I don't see why the addon would need access to my download history.

Merci Anonymous user 36ff4e : ça fonctionne !

Thanks Anonymous user 36ff4e : it works !

一部動画サイトのライブ配信でコメントビューアを起動するとか、お役所の古いサイトにありがちなOS標準ブラウザしか対応していないような化石サイトに飛ばされた為にブラウザを切り替える必要が生じたとか、特定のアドオンが効いている環境で見たい（或いは高負荷過ぎるコンテンツの為に最低限に絞ったた環境で見たい）サイトなのでブラウザを変えたいとか、そういった用途にこのアドオンは大変重宝していたのだが、Gの中の人にはお気に召さなかったらしい。
あちらは代替機能を提供するでなく排除してしまったので、仕方ないのでこれからもfirefoxをメインブラウザにします。

Look what you have done FireFox turned a once great simple addon into a complex addon.

6.8.6 version took some hacks for Basilisk.
I've got the toolbar button working on my Basilisk install matching the one on my Pale Moon install. Took some slight modifications of about-openwith.js, openwith.js, and openwith-fx.xul

It is cool seeing Pale Moon icon in my Basilisk and Basilisk icon in my Pale Moon status bars.
Also convenient for checking how sites render in IE, Edge, FF, Chrome easily.

I prefer the 6.8.6 version on my browsers which will continue to support XUL addons.

It may not be the developer's fault that he had to modify this extension like this, but now it is useless because too complicated to install. You have to understand what Python is and how to install it (on a Mac). I tried it several times and couldn't.

I thought the instructions were fairly simple. Install python. Open a command prompt and run the Python script. Great extension, very very useful.

Instruction for installation is insufficient, only thanks to user f495dc (not far below) i managed to install this app

i repeat it again here

1. Install Python (Download from link, run file, and then follow install screens)
2. Download the linked .py file and then move it to a special folder or the root of your C:/ drive (I put mine under the python install folder/Lib)
3. Open a Windows Command prompt (Type command or cmd into Start Menu search and select the cmd.exe)
4. Navigate inside the command prompt to the folder where you put the file in #2 (i.e. "cd c:\path_of_file_folder")
5. Run the command given in instructions: "open_with_windows.py install" (You must be in the same folder as the file)
6. Click Test in the extension info screen inside of Firefox. It will tell you immediately if it worked and you can begin finding/adding external programs to launch

It was good before, but the new install process with Python is complicated and I couldn't get it to work. :(

Followed the directions for Firefox 57. Doesn't work. I keep getting "open_with_windows.py is not recognized as an internal or external command, operable program or batch file." Lame.

It works well, you have to manually paste the path to your exe

Love the extension in Thunderbird but it is difficult to locate

Perfect for opening video links with mpv. It just works.

Loved this extension for such a long time and now on Firefox 57 is fantastic. Even better, developer Geoff has the support of his work that other developers should aspire to. Thank you.

simple to use and reliable