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FF eat 7gb memory on attempt to open txt file

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on attempt to open 90mb txt file FF eats 7gb of memory and broke txt font. pls check

screenshot attached

on attempt to open 90mb txt file FF eats 7gb of memory and broke txt font. pls check screenshot attached
Attached screenshots

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Does it make any difference if you download the file instead and then open it from disk? To save without opening, right-click the Raw button for the file and use Save Link As. (Or right-click whatever link you are using and use Save Link As.)