Thank you so much for your feedback and support!

In the latest update (v1.6.0), I have completely overhauled the login detection and session persistence mechanism:
1. Automatic Cross-Domain Cookie Sync: Logging in via E-Hentai Forums (.e-hentai.org) now automatically and immediately syncs your authentication cookies to ExHentai (.exhentai.org), and persists them across browser restarts.
2. Stale Cookie Cleanup: Cleans up invalid placeholder cookies ('0' / 'mystery') that previously caused the extension to misread your login state.
3. Container & Privacy Mode Support: Added full support for Firefox Multi-Account Containers, Private Windows, and First-Party Isolation.

Please update to the latest version and give it a try. Feel free to let me know if it works smoothly for you now!