Michael Bar-David wrote:

Sfter some searches, I understood that instead of using document.getSelection() in an extension, I should use window.content.getSelection(). But, I need to know it's length - and this JS code of the extension:
var word = window.content.getSelection();

document.getSelection() returns a string, but window.getSelection() returns a selection object. If you really want a string, you can use window.getSelection().toString() as a replacement.
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