Firefox Telnet Handler

im struggling with ubuntu 20.44 + firefox :
ive made and script to use a securecrt session, when i do double click in one node doesnt connect

NOTE : i replaced the real ipv4 add (is a public one) with x.x.x.x

sep 11 19:24:37 HP-Z440 firefox_firefox.desktop[14338]: /home/jjc/Documents/Tunel_SSH.sh: line 2: telnet://x.x.x.x:50717: No such file or directory
sep 11 19:24:37 HP-Z440 firefox_firefox.desktop[14336]: /home/jjc/Documents/Tunel_SSH.sh: line 6: exec: SecureCRT: not found
sep 11 19:24:39 HP-Z440 firefox_firefox.desktop[14347]: /home/jjc/Documents/Tunel_SSH.sh: line 2: telnet://x.x.xx:50717: No such file or directory
sep 11 19:24:39 HP-Z440 firefox_firefox.desktop[14345]: /home/jjc/Documents/Tunel_SSH.sh: line 6: exec: SecureCRT: not found

my biggest concern is why firefox_firefox.desktop doesnt regocnize SecureCRT binary because is in /usr/local/bin ($PATH env var has it)