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deleted by creator

You used that term, and frankly I recoil a bit a this term because of the implication that it’s not a deficiency of the software but that it’s the users who are wrong.
I wouldn’t say FF is deficient in this case - not being designed for your exact use case doesn’t mean there’s anything wrong with it.
As for opening 500+ tabs to buy a thing.
You do know that sellers now use algorithmic pricing and often there will be hundreds of sellers for the same thing.
Plus the price will be obfuscated with various artifices that all have to be overcome to find the best seller with the best price.
Defeating all of that means openning a shit-ton of tabs.
I usually only buy things if I agree with the price it’s being sold at. If I don’t I will look elsewhere but ultimately I value my time more than money. Extra money can be earned, time cannot 🤷♂️ If you have to drive 100 miles to a fuel station to save 2 cent per gallon, are you actually saving money?
Here’s an example of the process I’ve designed for aliexpress
https://github.com/igorlogius/gather-from-tabs/discussions/8
So it’s a script generating all the tabs?

The solution to write your own application that does what you want because your workflow is not a use case that browsers are designed for. It’s not bad to wish for features but your workflow is never going to be catered for in a browser and it’s both unreasonable and unrealistic to expect otherwise - hence you need to do it yourself.
If you can’t or don’t know how to do that yourself, I suggest you listen to the advice everyone else is giving you. Organisation does require ongoing work and given your comments it will likely require a lot of upfront effort to change your browser hygiene habits but once you are more organised it becomes a lot easier and a lot less work to stay on top of things.
It’s none of my business but I wonder why you feel it’s so important to open 500+ tabs just to buy something small online. Doing research and being informed is good but it seems disproportionate and perhaps talking to a professional might help you with that.
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What is wrong with your current car? Why does it need to be replaced? If it does need to be replaced, why does it have to a 2023 model?
Imo, if you’re not financially independent (i.e. not relying on your parents, own a home, emergency fund in place, retirement and pensions sorted) then you don’t need need to buy a car that new. It’s fiscally irresponsible. But I realise most of the US is trying to keep up with the Jones and feel the need to have a new car because it’s a new car and everyone else has a new car.

The only thing you’ll get for 300 new is a laptop shaped object - very similar in looks to laptop but essentially an expensive paper weight that pisses you off.

If you don’t care then accept you’re the reason we can’t have nice things.
It’s like saying I don’t care about freedom of speech because I have nothing important to say.
Not sure what your coding level is but you could interact with and scrape the sites with python. I’m sure other languages have similar frameworks.
Even if you aren’t very familiar and don’t know any pythons, it’s a good one to learn and though it could take a while to learn enough to do what you want, you would be more motivated to figure things out and it would save you a lot of time (and money) in the long term.
https://realpython.com/modern-web-automation-with-python-and-selenium/.
https://www.projectpro.io/article/python-libraries-for-web-scraping/625