Use jetpack window-utils instead of watchWindows #4
Description
https://addons.mozilla.org/en-US/developers/docs/sdk/1.5/packages/api-utils/docs/window-utils.html
as noted in AMO review comment.
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https://addons.mozilla.org/en-US/developers/docs/sdk/1.5/packages/api-utils/docs/window-utils.html
as noted in AMO review comment.