v1.5 — Security & Compatibility Update

• Improved security: replaced dynamic HTML injection with safe DOM manipulation in Word export
• Updated minimum Firefox version to 142 for full compatibility with data collection permission declarations
• No changes to functionality — all export features (Markdown, Word, Copy) work exactly as before

Added Firefox data collection permissions metadata required by AMO.
Updated minimum Firefox version to 140 to support the new manifest key.
No functional changes to extension behavior.