I am not able to install it for Firefox

[remonsec]

Facing this error
I am not good with those staff so dont know where i am making the mistake
Please help me to install this addon

[Francesco149]

install a nodejs version older than 12 for compatibility with gulp 3, for example on arch linux you have nodejs-lts-dubnium

[Francesco149]

btw for a permanent install do gulp ffa, it will generate a zip in firefox-zips.

then use firefox developer edition, change xpinstall.signatures.required in about:config to false (at your own risk) and then you can install addon from file in about:addons and select one of the zips.