Hi. Can you explain why two stars?
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1. If this is your first time using extension, then it takes time when you have a lot of items because it is loading them all at first. But after the first load every other time it is only syncing everything after last update and with latest version you can choose sync interval, so it doesn't have to be on opening every new tab.
2. What version of firefox are you using? I wasn't aware about that bug, because for my firefox it doesn't block address field.