Easy, easy ... First - you don't lose anything, just rename the files back and you're good to go.
Second - it's already fixed in 1.8.2, see https://github.com/QupZilla/qupzilla/commit/ef6842b9d7ed5ec29a3f44ada3b609254764f10f (that diff -> first facepalm of the day) --byte
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