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Why opera does't synchronize Extensions?
Because the feature wasn't implemented yet?
Until they "do it" you may use any backup system and any cloud service, just exclude Cache folders.
"You cannot know the meaning of your life until you are connected to the power that created you". · Shri Mataji Nirmala Devi
Please make it happened!!!
Well, it has already been requested on Suggestions Box so you can show your support there.