I've been to a recycling sorting facility (glass, paper, metal and plastic all go in the same bin here). The people working the conveyor belts had to practically wear hazmat suits, as whatever came in was vile. I rinse my containers extra clean since I saw that.
Not driving a car for long periods of time is bad for the car. That means that they would replace it after a few years, and still have two cars, instead of keeping just the one. It takes a lot of resources to build a car, even more so for EVs.
After looking over some of your posts on these Firefox communities, I believe you're well into "time to make my own addon" territory.
I've written a single addon myself, and while I found documentation to be lacking, it isn't as hard as it first feels. What really helped is finding other plugins on GitHub that did something somewhat related to what I was attempting, which gives you a solid base.
In case you missed brewery's message below (as it's a second-level comment): all private mode does is to temporarily prevent storing history and cookies on your device. You can set that as default behavior for normal browsing instead.
Why base it on human body temperature at all though? That's only useful when you're trying to see if you have a fever, and even then that's a number that varies wildly between people.
Air temperature is what we most often measure and talk about, and it needs to be far below body temperature to be comfortable.
Nice! Can't take all the credit for mine, most of the work was done by Dan for the Makelangelo.