Esse script (citado abaixo) funcionou para mim. Não há necessidade de terminal:
How to fix Adobe Flash issue on Mac OS X 10.5.8 with allow-outdated-plugins switch and restore Chrome functionality (step-by-step screen shots included):
Step 1. In Finder goto the Finder pull-down menu -> Services -> Script Editor -> Make New AppleScript
Step 2. Copy/Paste the following into Script Editor:
do shell script "/Applications/Google\
Chrome.app/Contents/MacOS/Google\ Chrome --allow-outdated-plugins &
killall ChromeScript.app"
Step 3. Goto File -> Save As -> **FILENAME: ChromeScript (File Format: select "Application"; Options: make sure only "Run Only" is checked)
**BE SURE TO NAME YOUR FILE ChromeScript FOR THE APPLESCRIPT TO WORK CORRECTLY
From now on you will use your new ChromeScript app to open Chrome. You can also replace your "old" Chrome icon in your launch bar with the new script for convenience. Remember to manually update your plugins once in a while because Chrome will no longer do it automatically.
Você poderia me dizer como você roda o terminal? Não funcionou, não importa como eu executei comandos, então estou apenas curioso.