How many pages can be open in one single tab before I lose the first page of the tab?

I use a tab for weather info on many places and I have lost the first few ones if I put too many places. Example: First page is Vancouver, last New York, and in the middle many places. How much pages is it safe to put in a single tab without losing ANY places from the beginning of the tab? EXTREMELY irritating to lose ones as I have to put all the places again (of course in fewer numbers)!
PS.Mozilla: If I shut down Firefox and I'm in the end of the tab containing the previous weather pages, I only get around 10 or so places backwards and lose all others, this SHOULD CHANGE! I want to have at least 30 places backwards there when I come back! Weather is not the only thing where people want tab-pages to be saved and safely there for the next session. This has bothered me for a year, please change this!

I'm not totally sure how many pages Firefox can remember. Its a lot though. If you want to view them, and count them if you want, click the back icon and hold it and a list will come up of recent web pages. I like your change idea though.
Cheers
Jon

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