Viewhance by Deathamns

Enriches the built-in media viewer with different customization possibilities and functionality.

Features:
- Default sizing modes and switching between them via shortcuts or mouse clicks
- Custom CSS (background color for the page or media, hidden scrollbars...)
- Custom information about the media in the tab title
- Floating menu (mouse cursor over the top-left)
- Mouse wheel zooming (off by default)
- Centering content (default)
- Rotate/Flip (via shortcuts or from the menu)
- Sending the URL to different services (such as reverse image search)
- Frame extraction for animated images (GIF, APNG, WEBP)
- Handling SVG and data:URIs
- Forced inlining (show media instead of download)
- Native DASH, HLS, MSS streaming (if the browser can support it)
- Customizable media attributes (autoplay, loop, controls, mute, volume)
- Opening images from regular web-pages with right long-press or with shortcut (off by default)

Check out the Options page for more details.