Hi! Please share the websites where you've observed this with us at: https://proton.me/support/contact, so we can document your feedback for future improvements. In the meantime, you can add these domains to your Pause List (Main menu → Settings → General), to prevent Proton Pass from interacting with them.

Thank you for your review and feedback! Except for certain functionalities like syncing/adding new aliases etc. which would require you to be online, the Proton Pass extension can already be used offline. As for the password generator, you can easily access it by selecting the '+' icon → Password.