RTL toggle, developed by trl toggle, is a Firefox extension that reverses page orientation to simulate Right-to-Left reading environments for web pages. The extension changes document direction and adapts text alignment so developers can inspect how Arabic, Hebrew, Persian, or Urdu content affects layout and element flow. Designed for web developers performing layout validation and for users who read RTL content, the tool aims to simplify quick orientation checks during development and testing.

It plugs into browser workflows to let testers flip page direction on demand

The extension integrates with Firefox's native add-on framework and provides a direct control for switching page orientation, which developers can use during iterative UI checks. Integration with the browser allows testing without external tooling, and the control fits into an existing dev workflow that includes live-reload and in-browser inspection. Typical uses include checking mirrored navigation, sidebar placement, and element ordering during rapid visual verification.

It focuses on language-appropriate alignment for specific RTL languages

RTL toggle explicitly addresses layout differences that appear with Arabic, Hebrew, Persian, and Urdu by applying language-specific text alignment rules. Developers can observe changes to text flow, form fields, and table alignment in context, which helps isolate CSS direction or alignment regressions. This is a targeted tool for validating reading-direction impacts rather than a broad localization platform.

It suits quick checks and advanced layout experiments but has limits

The extension offers an experimental feature set for advanced layout testing, signalling active development and potential instability on some sites. Experimental status means developers should treat results as preliminary and include full localization QA in later stages. The tool's narrow scope concentrates on orientation and alignment instead of translation workflows, accessibility audits, or string management.

It supports mobile and desktop testing with a small installation footprint

Compatibility extends to Firefox on desktop and Firefox for Android, enabling on-device verification during responsive testing. The extension installs as a compact add-on, with a reported footprint of approximately 1.36 MB, which makes it convenient for field checks on multiple machines or devices. Cross-platform availability helps replicate behavior across environments encountered during development and QA.

A focused option for developers needing rapid RTL checks, with caveats

RTL toggle is a focused choice for web developers who need fast orientation checks during responsive or layout testing, because it targets direction and alignment scenarios specifically. Given its experimental feature set and modest user base, it serves best as a supplemental tool for early-stage validation rather than as the sole instrument for complete localization or production verification.