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New keyboard shortcut to toggle on/off (Ctrl-Alt-Z by default, changeable under Manage Extension Shortcuts).

Use local storage instead of sync storage for preferences. This fixes a bug with how sync storage was used, and makes it so that settings are device-specific instead of common across all devices used by the account.

Zoom factor and threshold are now configurable in the addon's preferences.

New browser action toggle button to enabled/disable ffreszoom.