Version 1.3.1:
- Pixel-perfect hover hit-testing (0px tolerance): trigger only when cursor directly touches text characters.
- Instant boundary leave detection (0px): dismiss timer starts immediately upon leaving text bounds.
- Refined text hit-testing for both webpage content and PDF viewer.

Version 1.3.0:
- Added Multi-Engine translation support: Bing / Microsoft Edge Translator, DeepL AI, and Google Cloud Neural Machine Translation (NMT).
- Seamless automatic failover chain ensuring zero-interruption translation experience.
- Added translation engine selection dropdown in the popup settings.
- Smarter technical term handling: single-word lookups display Vietnamese definitions, while sentence translation preserves IT keywords in context.
- Refined popup UI with compact layout and improved typography.

What's new in version 1.1.0:

• Dedicated PDF Reader & Translator: Read and translate PDF documents with an interface designed 1:1 like native Firefox PDF.js.
• Smart Sentence Segmentation: Intelligent bullet-point and heading separation for crisp, accurate translations without text clump.
• Enhanced Tooltip Transitions: Smooth 200ms fade animations and a 400ms grace period on mouse exit for seamless reading.
• Full PDF Controls: Document outline navigation, page thumbnails, and responsive zoom options (Automatic Zoom, Page Fit, Page Width).
• Performance Improvements: Zero interference with native browser PDF viewing and optimized translation caching.