Video Justifier by Mischa
Justify videos to the left or right in theatre/fullscreen mode.
Extension Metadata
About this extension
A lightweight Firefox extension designed mainly for multi-monitor setups. When a video is playing in theatre mode or fullscreen mode, this extension allows you to shift the video frame to the left or right, rather than the default centre, replacing the default black bars. This is done by overriding the site's default CSS positioning rules, foregoing the need for complex JavaScript tracking.
Supported Platforms
Usage
You can justify the video using either the extension popup menu or with the following keybinds:
(Note: Keybinds can be changed in the Firefox Add-ons manager under the gear icon > "Manage Extension Shortcuts").
Supported Platforms
Usage
You can justify the video using either the extension popup menu or with the following keybinds:
- Justify Left:
Ctrl+Alt+Left Arrow - Justify Centre:
Ctrl+Alt+Down Arrow - Justify Right:
Ctrl+Alt+Right Arrow
(Note: Keybinds can be changed in the Firefox Add-ons manager under the gear icon > "Manage Extension Shortcuts").
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Permissions and data
Required permissions:
- Access your data for sites in the youtube.com domain
- Access your data for sites in the twitch.tv domain
- Access your data for sites in the kick.com domain
Optional permissions:
- Access your data for sites in the youtube.com domain
- Access your data for sites in the twitch.tv domain
- Access your data for sites in the kick.com domain
Data collection:
- The developer says this extension doesn't require data collection.
More information
- Add-on Links
- Version
- 1.0
- Size
- 11.25 KB
- Last updated
- 25 days ago (Feb 24, 2026)
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- Version History
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