This looks neat, it's a shame I wouldn't be caught dead paying $24/year for a browser extension. I recommend that you seriously rethink your business model, even if that means consolidating it into a one-time purchase. Remember, you're selling zero-margin-utility here: this isn't an SAAS (and if it is, I'd argue you've done something wrong). Even still, it's hard to make the case for using this tool over other, free options...