Web Viewing Assist 作者： 1llum1n4t1

A productivity helper that bundles 8 categories of features into a single popup.

■ Features available on Firefox
🔹 Session Keep-alive
Dispatches synthesized activity events and same-origin HTTP pings to suppress auto-logout on intranet portals and admin dashboards. HTTP ping is opt-in (default OFF), uses 5-second AbortSignal timeout, same-origin only, redirect: manual to prevent credential leakage to third-party domains.

🔹 YouTube Cleaner (29 sub-features)
Remove search-result noise, Shorts removal (5 sub-features), watch-page tidying, comment/live-chat hiding, grid column count, subscription channel expansion (subs feed → grid + lazy thumbnail), and more granular controls for YouTube's verbose UI.

🔹 Amazon Subscribe & Save totals
On amazon.co.jp/auto-deliveries, computes per-month delivery totals and inserts them inline.

🔹 Instagram Cleaner (11 sub-features)
Hides Reels / Explore / Stories / Threads / like counts / videos / comments / Notes / message counters, and similar verbose UI. Uses only semantic selectors (aria-label / role / data-pagelet); no dependency on obfuscated class names.

🔹 TikTok Cleaner (3 sub-features)
Hide comments / hide "Suggested accounts" / image download button.

🔹 Video Gamma
Global slider applies gamma correction to <video> elements (custom SVG <feComponentTransfer type="gamma"> implementation).

🔹 Loupe
Mouse-following circular magnifier. 3-step zoom / variable lens size. Uses tabs.captureVisibleTab so videos / iframes / canvases can also be magnified.

🔹 Color Picker (popup tab)
EyeDropper API based. HEX / RGB / HSL formats with up to 20 history entries stored in browser.storage.local only (no external transmission).

■ Differences from the Chrome edition
The Chrome edition adds a Volume Booster (tab audio amplifier with auto gain, normalizer, night mode, etc.). Volume Booster depends on chrome.offscreen and chrome.tabCapture, neither of which is supported by Firefox MV3, so it is excluded from the Firefox build. We plan to port it once Firefox implements these APIs.

■ Privacy
Fully local execution; zero external network calls. Only browser.storage.local is used (no sync / no cloud). See docs/privacy-policy.md for details.

■ Requirements
Firefox 140 or later.