########## steps to sign and build xpi ##########
- download web-ext https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Getting_started_with_web-ext
- cd into root folder
- modify manifest.json, update version: "version": "1.0.25"
- run "web-ext sign --api-key user:14261568:736 --api-secret 8ad0b9bbe6087feaeb176655bb184a1d88591a0be6ad4e182bc62004d85d6d5a" (note, user/api-secret is my account which I use speifically for gatIDEX, NO NEED to change)
- there is a new xpi is created under web-ext-artifacts folder. eg: gatidex-1.0.29-an+fx.xpi
########## Trouble Shoots ##########
- TypeError: Cannot read property 'R_OK' of undefined balena-io/balena-cli#712