• Muted tabs disappearing from the popup's tab list, with no way to unmute them from there, since tabs.query({ audible: true }) can drop a tab as soon as it's muted.
• The in-page widget's mute icon going stale: it was only ever read once at widget creation, so muting from the popup (or the tab strip, or a keyboard shortcut) never reached it. The background script now forwards live mute-state changes to each tab's widget.
• The widget's expanded button row always ending with the collapse (X) button, which stranded it on the far side of the panel when anchored on the left edge. The row now mirrors so collapse stays on the same edge the icon was opened from.

• The widget's saved drag position is now kept per-site instead of applying globally, since a spot that works on one site's layout may collide with controls on another.

Fixed

MUBI (and other slow-DRM sites) videos not loading — the extension used to tap every media element into the Web Audio API after a fixed 1500ms delay to enable volume boost. On sites where DRM license negotiation takes longer than that, this happened before decryption was ready and permanently broke playback. The upgrade is now gated on the element's playing event instead, so it never runs ahead of DRM initialization.
In-page widget appearing even when disabled — right after a page refresh, the widget could briefly ignore the saved "disabled" preference, because the audio-element scan could run before the stored setting finished loading. The scan now waits for the setting to load first.
Widget position not remembered — the floating widget always reopened in the same bottom-right corner. It now opens near the media element that triggered it, and remembers wherever you last dragged it to.

Version 2.4.0 is an architectural and maintenance update focused on security, code maintainability, and project structure. The user-facing features and interface remain unchanged, but the underlying codebase has been fully reorganized to meet current extension development standards.

• Removed innerHTML: Addressed Mozilla Add-on Store security feedback by replacing all innerHTML assignments with a secure DOMParser implementation to strictly prevent Cross-Site Scripting (XSS) risks.

• Directory Restructuring: Migrated from a flat file layout to a modular src/ based directory structure, isolating concerns into background, content, and popup components.
• Content Script Modularization: Split the monolithic content script into distinct modules:
• content.js: Handles core audio interception, Web Audio API routing, and DRM detection.
• widget.js: Manages the in-page floating UI logic, dynamically extending the audio controller.
• CSS Extraction: Removed inline <style> tags from HTML files and DOM injections. All styles are now maintained in dedicated .css files, with the widget styles loaded at runtime.

• Documentation and Typing: Applied strict mode ('use strict') across all JavaScript files. Documented all classes, methods, and parameters using JSDoc annotations.
• Code Cleanup: Extracted magic numbers and hardcoded strings into named constants. Replaced lengthy if/else chains with switch statements for cleaner message routing.
• Build Process: Introduced a shell script (build.sh) to automate the creation of clean, store-ready deployment archives. Added a .gitignore to prevent tracking of build artifacts and environment files.

• Enhanced Security Standards: Removed all innerHTML assignments across the extension to prevent Cross-Site Scripting (XSS) vulnerabilities.
• Store Policy Compliance: Fully updated DOM manipulations using DOMParser to comply with strict Mozilla Add-ons and Chrome Web Store security guidelines.

• Menu UI Optimization: Refined the popup menu layout for better usability and a more polished look.
• Volume Slider Fixes: Resolved issues with the volume slider behavior to provide a smoother and more precise volume control experience.

• DRM Compatibility (MUBI & others): Fixed errors related to DRM-protected content (like MUBI). The extension now correctly identifies DRM-protected media and safely limits volume boosting to prevent audio distortion or playback crashes.

Notes to Reviewer (for Add-on Store Submission):
* All previous innerHTML warnings flagged by the validation tool have been addressed by implementing a safe setSafeHTML helper using DOMParser.
* No external libraries or minified code are included.

TabMixer v2.3.2 Release Notes

Bug Fixes
* Fixed a critical issue where lowering the volume slider below 100% triggered an asynchronous loop, causing the audio to unexpectedly drop to zero (mute).
* Resolved a double-dipping volume bug on non-DRM websites where volume changes were incorrectly applied to both the native media element and the Web Audio API gain node simultaneously.

UI & Theme Improvements
* Updated the primary extension theme to a refined, dark olive green.
* Redesigned the volume sliders in both the extension popup and the floating page widget to dynamically fill with the new theme color as the volume increases.
* The widget toggle switch and state buttons (Mute/Reset) now seamlessly match the updated color scheme.

TabMixer 2.3.1 Update

• Improved volume control compatibility for web audio players including Spotify.
• Updated button accent color theme to sage green for muted and active states.
• Automatically prefix missing site names in tab titles for better clarity.
• Refined UI layout and volume slider styling for light and dark themes.

TabMixer 2.3.0 Update

🎨 Minimalist Slider Design: Replaced the colorful rainbow track with a sleek, modern, neutral slider design that seamlessly integrates with light & dark themes.
🎵 Smart Tab Titles: Automatically prefixes tab titles with site names (e.g., "YouTube | Song Title") when missing for quick tab identification.
📐 Overflow & Layout Fixes: Improved title truncation and scrollbar prevention for a clean, compact interface.

TabMixer 2.2.0 Update

🎵 Smart Tab Titles: Added automatic site name prefixes (e.g. "YouTube | Song Name") to tabs when missing, making audio sources easier to identify.
✨ Clean UI & No Scrollbars: Improved title truncation and popup overflow handling for a smooth, scrollbar-free interface.

TabMixer 2.1.0 Update

↺ Per-Tab Reset Button: Added an individual reset button to each tab item so you can reset specific tab volume to 100% with a single click.
🎨 Light & Dark Mode: Full automatic theme support matching system and browser dark/light mode preferences for both popup UI and in-page widget.
📐 UI Refinements: Moved the "Reset All" button to the header corner for a cleaner and more compact interface.

TabMixer 2.0.0 — Major Update

🎛 In-Page Volume Widget A floating volume control now appears directly on pages playing audio. Click the speaker icon in the bottom-right corner to quickly adjust volume without opening the popup. Can be toggled on/off from the popup settings.

🔒 DRM Compatibility TabMixer now works on DRM-protected sites like Netflix, Spotify, MUBI, and Disney+. Volume control (10–100%) is available on these sites using safe direct control that never interferes with content playback. No more "DRM Protected" warnings.

🧠 Automatic DRM Detection Replaced the hardcoded site list with real-time EME (Encrypted Media Extensions) detection. TabMixer automatically detects DRM content and adjusts its behavior — no manual configuration needed.

🔊 Volume Boost Non-DRM sites continue to support volume boost up to 150% via Web Audio API.

🖼 Store-Ready Icons Added 48px and 128px icon sizes for better display across Firefox UI.

Initial release of TabMixer

Features:
- Individual volume control per tab (10-150%)
- Per-tab mute/unmute functionality
- Smart reset button for all tabs
- DRM content detection with clear warnings
- Privacy-focused: no data collection, all settings stored locally
- Minimal and lightweight design

Technical:
- Manifest V2
- Zero external dependencies
- Local storage only