There is no upload that can be sent to firefox. Firefox isn't in the business of hosting personal files beyond posting for Browser updates to download and install. For issues with extension issue you need to contact whomever you contact about extensions issue. Remember this is a End User forum only and can't do anything as what your asking.

Firefox is the name of the web browser (third name actually) as the company is Mozilla (common knowledge). Mozilla is in the business of hosting Extensions as for example addons.mozilla.org even for personal use.

Also please stop telling people if they want help for anything but bare bone default Firefox install that they are out of luck in getting support.

Im not even sure if this is possible, but figured id post here rather than email FF support and clog up time. ~ I have a file i use on firefox, using the developer mode as a way to turn it into an extention but anytime i reboot my firefox it clears and i need to go into developer mode and make the file an extention on my browser once again. I was wondering if theres a way i can upload the file to my firefox, as an almost local/private extention just for me. Its nothing malicious, simply helps me use a VPN to watch F1TV pro as im from the UK and it doesnt work here. The extention im working isnt made by me, and hasnt been approved by firefox to make it an extenion, maybe it violates some of their terms? not sure. But i know its legit, and trust it myself its just a hassle to use. Id love some help here on if this is even possible!

There is no direct support by phone, chat or email anyways.

For help with extensions development you could post at https://discourse.mozilla.org/c/add-ons/35

https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions https://extensionworkshop.com/