Steps for installation:
1. git clone https://firstname.lastname@example.org/jedihy/jalangi2-chrome.git
2. cd jalangi2
3. npm install
4. mitmdump -p 9999 --anticache -s "jalangi2/scripts/proxy.py --inlineIID --inlineSource"
In this version, you have to use port 9999 for mitmdump because the port number is hardcoded in the extension.