Prevents Firefox from launching if started first on Ubuntu 16.04

[Torniojaws]

I had this happen to me just now:

1. Boot into Ubuntu 16.04 64-bit (in Vagrant VM)
2. Launch Atom (1.21.1 x64) with symbols-list (2.4.1) installed
3. Opened a Python project with the symbols-list visible
4. Attempted to launch Firefox (58.0.2 64-bit)

Expected: Firefox starts normally
Actual: Firefox would not start after many attemps. It gave a message that "Firefox is already running, try closing..."

I had no visible Firefox instances open, so I did:
$ ps -ef | grep firefox
And got this:

vagrant   2636 32755  0 12:53 pts/0    00:00:00 grep --color=auto firefox
root      9297     1  0 12:26 tty1     00:00:01 /usr/lib/firefox/firefox https://atom.io/packages/symbols-list

Then I killed the process ID 9297 and started Firefox successfully. Even symbols-list appears to work still in Atom.

Maybe it's a one-time thing, though, since it's quite strange. Could be an auto-update thing?

[mbuc82]

Hello @Torniojaws ,

do you still face this issue with the latest versions of firefox, atom and symbols-list?
Although i'm not using Ubuntu 16.04, i can't reproduce the described problem on Ubuntu 17.10 nor on Linux Mint 18.3.

Thank you in advance for your feedback!

Cheers
Marco