GTMA Internal Traffic Flag per Kevin Phillips

GTMA Internal Traffic Flag v1.0

This extension is used by employees of GTMA Agency to mark their own visits to client websites as internal traffic. When enabled, the extension sets a first-party cookie on the active website: gtma_internal = "yes". This allows Google Tag Manager to classify internal analytics traffic and exclude it from reporting.

No user tracking, external requests, or data transmissions occur. All data stays on the local browser. No account, API communication, or remote server interaction is used.

Testing instructions for reviewers:
1. Install the extension.
2. Open any website.
3. Click the GTMA extension icon and click “Enable Internal Flag”.
4. A cookie named "gtma_internal" will be created on that site with value "yes".
5. Disabling the flag deletes that cookie.
This completes all functionality; no login or external interaction is required.

This initial version contains:
- Popup UI to toggle internal traffic flag
- Domain list management stored in local browser storage
- Background script that writes/deletes the cookie based on user action
- No personal data collection; declared as "none" per Firefox data collection requirements