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[hypnagonia]

• extracting hostname from tab system object in the background script instead of passing it from webpage
• now content script checks tabId before broadcasting event to the rest of the page, not necessary but...
• broadcasting getAccount and signTx events to all tabs replaced by popupClosed event, now content script counts pending requests and if there's none left doesn't broadcast popupClosed to webpage at all
• introducing lock, now when a page requests the account or signing a tx, wallet is not available for other tabs, all other requests pending till wallet is free again