#! /bin/bash
 echo "argc: $#"

Dear community, The question I am about to ask is the same I asked on SuperUser quick a while ago, but got no answer: https://superuser.com/q/1300709/879171 ---------------------------------------------------------------------------- I have a bash script to handle magnet links. But it looks like firefox does not send any arguments to the script. To demonstrate the problem, the following script is enough: #! /bin/bash echo "argc: $#" I wrapped this script into an Automator application (because Firefox requires a *.app for the handler). I used the Run Shell Script Actions, set the Pass input option to as arguments and the Shell option to /bin/bash. I also used a Display Notification Actions to display the result. In Firefox about:config, I set the 'network.protocol-handler.expose.magnet' entry to 'false' as suggested. 1. Firefox does run the application when I click on magnet:// links, 2. From Firefox, the Finder notification always displays 'argc: 0', 3. If I drag & drop a file onto the application icon in Finder, the message is 'argc: 1'. I use Firefox 58.0.2 and macOS High Sierra 10.13.3. ---------------------------------------------------------------------------- Problem is still true today with Firefox 61.0.2 and macOS High Sierra 10.13.6 I also tried to mimic the properties of the 'mailto' protocol by adding the following properties: network.protocol-handler.external.magnet -> TRUE network.protocol-handler.warn-external.magnet -> FALSE Below is a list of all the available bash variables when script is executed. The list is obtained by running '(set -o posix; set)'. : Apple_PubSub_Socket_Render=/private/tmp/com.apple.launchd.Cv7mgR3VJ2/Render : BASH=/bin/bash : BASH_ARGC=([0]="0") : BASH_ARGV=() : BASH_EXECUTION_STRING='( set -o posix ; set ) > ~/Desktop/mozilla.txt' : BASH_LINENO=() : BASH_REMATCH=() : BASH_SOURCE=() : BASH_VERSINFO=([0]="3" [1]="2" [2]="57" [3]="1" [4]="release" [5]="x86_64-apple-darwin17") : BASH_VERSION='3.2.57(1)-release' : DIRSTACK=() : DISPLAY=/private/tmp/com.apple.launchd.9sK8D5xtMv/org.macosforge.xquartz:0 : EUID=502 : GROUPS=() : HOME=/Users/***** : HOSTNAME=mac-***** : HOSTTYPE=x86_64 : IFS=' ' : LOGNAME=***** : MACHTYPE=x86_64-apple-darwin17 : OPTERR=1 : OPTIND=1 : OSTYPE=darwin17 : PATH=/usr/bin:/bin:/usr/sbin:/sbin : PIPESTATUS=([0]="0") : POSIXLY_CORRECT=y : PPID=7785 : PS4='+ ' : PWD=/Users/***** : SHELL=/usr/local/bin/bash : SHELLOPTS=braceexpand:hashall:interactive-comments:posix : SHLVL=1 : SSH_AUTH_SOCK=/private/tmp/com.apple.launchd.xhDg6k4yjb/Listeners : TERM=dumb : TMPDIR=/var/folders/7d/64z_mqvd10jfhq0_k_044jhw0000gp/T/ : UID=502 : USER=***** : XPC_FLAGS=0x0 : XPC_SERVICE_NAME='com.apple.automator.*****.22644' : _=posix : __CF_USER_TEXT_ENCODING=0x1F6:0x0:0x0 Any help is appreciated.