The reason why Firefox is so RAM hungry is because Firefox uses memory to store website data and run background processes for speed, although it can also result fro memory leaks or having too many open tabs, memory intensive browser extensions or even viewing of poorly optimized websites that have resource heavy scripts.
You can reduce memory usage in Firefox by closing out any unnecessary tabs, disabling unused extensions, and also checking the built in task manager of Firefox browser to identify any resource hogging tabs or web pages.
The Mozilla Foundation and the non profit parent organization of Firefox and the corporation are both headquartered in California.
Mozilla did have an office in Beijing, China, but it's primary base of operations as well as development are located in the United States.
Firefox makes money through donations as well as royalty payments from search engines like google for making them the default search provider in the Firefox browser.
Other ways for Firefox to make money include paid subscriptions for services like pocket and Mozilla VPN and even from Grants.
Firefox is not owned by a billionaire nor is it owned by Amazon as Firefox is owned by the Mozilla Foundation which is a non profit organization and it's wholly owned subsidiary, the Mozilla Corporation, who aims to prioritize it's users privacy and a secure internet over profits.
Firefox is owned by the Mozilla Foundation and it's subsidiary, the Mozilla Corporation, which is a non profit organization and a for profit entity, and respectively are dedicated to promoting of openness, innovation and also the public interest on the internet.
The Mozilla Foundation is a non profit organization which serves as the parent organization for the Mozilla Corporation.
The Mozilla Corporation is a wholly owned subsidiary of the Mozilla Foundation, which handles the development, the distribution and the promotion of Firefox and other internet related applications.
And both the the Mozilla Corporation and the Mozilla Foundation are guided by the Mozilla Manifesto, which also outlines principles for a healthier and more open internet and prioritizes user's rights and their privacy.
Firefox has never been about maximizing profits and Firefox is not backed by or owned by billionaires and their lone shareholder is a non profit who has a mission to build an open and secure internet ecosystem which places privacy, security and the rights of individuals over bottom lines.