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If there is highlighted text, a new option is added to the context menu. This option search the definition of the highlighted text at Google (like searching "define:some_text").
To create your own collections, you must have a Mozilla Add-ons account.
Some add-ons ask for permission to perform certain functions. Since you’re in control of your Thunderbird, the choice to grant or deny these requests is yours.
Please note this add-on uses legacy technology, which gives it access to all browser functions and data without requesting your permission.