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why firefox keep deleting my history? i try to reinstall it but it won't work. help me please.

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I just upgrade my windows and reinstall my firefox. then it won't make me save my history. at first the history saved. but when I restart my laptop then open my firefox the history won't show up. and i try to reinstall but nothing changes. help :(

I just upgrade my windows and reinstall my firefox. then it won't make me save my history. at first the history saved. but when I restart my laptop then open my firefox the history won't show up. and i try to reinstall but nothing changes. help :(

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I expect you are deleting your history at the end of your session, as opposed to only clearing cache.

Make sure your are saving history, then in the settings that you are not clearing history.

Tools > Options > Privacy you must have "Remember my browsing history" and in Settings where check marks mean to clear things you must leave unchecked "Browsing history". Annotated picture:

FWIW, App-tabs are considered part of browsing history so you must save your browsing history for app-tabs to work.