Wonderful! I've given it a go, works in Apple's Notes app, but it does not seem to trigger suggestions in Chrome, Firefox or Slack. It does however highlight misspellings there. Any idea what can I do to enable suggestions there? I was looking for a product like this.

Same here, but Siri also does not trigger its textual improving LLM thingy in the context menu in Firefox.

Same! Interested in this but need it to work for Slack, where I often type more informally and don't take the time I should to proofread.