Tab Hide Permission Verification UI/UX:
- Added a user-friendly permission warning banner (.permission-banner with interactive controls) to popup.html when the tabHide browser permission is not yet active/confirmed.
- Prompts the user to trigger the Firefox native permission doorhanger and guides them to choose "Keep" (allow).
- Deferred Verification: Triggered only upon the first time the user opens the extension popup (clicking the addon icon) rather than at installation or startup, ensuring a non-intrusive install experience.
- Integrates background verification check (check-tabhide-permission action) that programmatically verifies permission status using a temporary tab.

TST State Restoration Hardening (mitigating Issue #13 race conditions):
- State Locking (snapshotInProgress): Added module-level lock to ensure atomic TST state capture and prevent overwriting clean snapshots.
- Persistence Tracking (originalTSTTreeSnapshotTaken): Tracks pre-search tree states to prevent trying to restore un-snapshotted states.
- Error Boundaries (try...finally): Wrapped all main TST orchestration blocks to guarantee state tracking resets even on communication failures.
- Delayed Restoration & Activation Grace Window: Handles Firefox out-of-order events upon popup close and preserves branch expansion for the newly activated tab.
- Search Operation Queue (pendingSearchMsg): Intercepts and queues rapid keyboard input to ensure search operations run sequentially and cleanly.
- Empty Search Term Restoration: Triggers immediate restoration of tree states when the search input is cleared/emptied, even if the popup remains open.
- Awaiting Active Searches on Reset/Close: Cancels pending search requests and awaits active search completion with a 5-second timeout safeguard to eliminate race conditions.

v0.7.0 (2026-05-03) - Fuzzy Matching and Documentation Overhaul

• Added Fuzzy Matching powered by Fuse.js v7.3.0.
  • Integrated Token Search for superior multi-word matching (e.g., searching "Mail Google" finds "Google Mail").
  • Intelligent relevance ranking using BM25-style IDF weighting.
  • User-configurable threshold slider (0.0 to 1.0) in the popup.
  • Persisted settings across browser sessions.
• Standardized Documentation & Guidance.
  • Added theme-aware (Light/Dark mode) info pages for Fuzzy Matching, Privacy, and Search Contents.
  • Standardized page titles and added addon favicons to all extension pages.
• TST Hardening and Mitigations.
  • Implemented mitigations for Issue #13 regarding TST tree restoration reliability.
  • Implemented state locking and robust error boundaries for TST communication.
• UI/UX Refinements.
  • Modernized all info pages with a unified card-based layout and standardized typography.
  • Improved "Close Guide" button reliability across all help pages.

v0.6.0

• Clarified option reset behavior in the popup.
  • Search-affecting options clear the active search and restore tabs to their pre-search state.
  • Both TST options ("Support for Tree Style Tab" and "Auto-expand trees with matched tabs") now reset an active search to ensure TST state is fully restored.
  • "Select all matching tabs on close" and "Disable initial hide action" do not reset an active search.
• Updated the TST search presentation.
  • Flattened search results now keep a consistent left and right gutter while searching.
  • Added defensive TST CSS so custom tab margins are less likely to break the flattened search layout.
• Updated the popup relationship between TST options.
  • The "Auto-expand trees with matched tabs" option is now progressively disclosed and only shown when TST support is enabled.
• Updated info-button behavior in the popup.
  • Opening privacy/content help now first resets any active search, then opens the help page in an active tab and closes the popup.