Is there an extension for Firefox that shows the number of unread VK messages?

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Is there an extension for Firefox that shows the number of unread VK messages? For Chrome, there is such a thing - it is called VK Checker. Shows on its icon the number of new VK messages. But what about Firefox? In the Amigo browser, this topic is generally developed - there, in a separate block, you can generally communicate with VK and listen to music. But somehow I don’t want to install the Amigo browser, I prefer Firefox. Any ideas?