Pretty straight forward, a decent add-on. Seeing a WPM without switching to reading mode is good addition. My only critism is that small popup element needs more customization options and user should be able decide specific websites where popup automatically hides. Since there's no advanced exclusions, small popup showing up irrelevant websites where reading an article/post isn't main focus like Twitch, WhatsApp Web, Telegram Web etc. At least there should be a toggle button.

Simple but good.

Very usefull. Would be interesting to be able to adjust the reading speeed (words per minute).