Custom Browser Extension Development

I'm looking for an experienced developer to create a custom browser extension compatible with Chrome, Edge, and Firefox. The extension should include the following features:

- Change IP
- Save passwords
- Reminders for dates
- Save a note

Ideal Skills and Experience:
- Proficiency in developing browser extensions for multiple browsers.
- Strong knowledge of security protocols, especially for password management.
- Experience in implementing features that change IP.
- Ability to create user-friendly reminder systems and note-saving functionalities.
- Familiarity with the browser APIs of Chrome, Edge, and Firefox.

Please provide examples of similar work done and your approach to ensure security and privacy for users.