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Migrating from ff55 to ff49 in a less invasive way..

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Hi, could anyone advise me which files to delete (i guess the whole firefox installation folder should go) + some files in the profile directory & a few major about.config references i could remove from my prefs.js so i could downgrade without refreshing & ruining a lot of previous config settings settings ?

Hi, could anyone advise me which files to delete (i guess the whole firefox installation folder should go) + some files in the profile directory & a few major about.config references i could remove from my prefs.js so i could downgrade without refreshing & ruining a lot of previous config settings settings ?

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main issue:

Actually:

bookmarks & history doesn't function.

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What should i delete relating to this too:

IndexedDB, the (DOM) Cache API, Service Workers, and the asm.js cache will all fail to operate