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Let Your Designs Fail for the Right Reasons
Building prototypes inside native device builds, such as a local Firefox Android installation, provides more realistic usability feedback than Figma prototypes.
What: Mozilla designers prototyped a site-reporting feature directly into a live Firefox Android build, allowing them to test real network conditions and branching logic.
Why it matters: Native prototyping is replacing static design tools for complex interactions where latency, OS-level constraints, and real data states impact usability performance.
Takeaway: When testing critical features that rely on network conditions or device APIs, bypass design tools and implement a prototype directly into a local development build.
Deep dive
- Figma lacks the ability to simulate real network latency and device-specific constraints.
- Native prototyping requires engineers to work closely with designers within the IDE.
- Realized usability errors were caught that static mockups completely missed.
- AI tools in the editor accelerate the prototyping phase for non-engineers.
- Native fidelity ensures that the final product does not deviate from the intended design.
Decoder
- Native fidelity: A prototype that runs on the actual target hardware or operating system, inheriting its performance and behavior characteristics.
Original article
Prototypes built in Figma limit users to predefined paths, making it hard to tell whether a usability failure came from the design or the prototype. Building the Report Broken Site feature directly into a local Firefox Android build with AI produced a prototype with native fidelity to the device. The approach handles branching logic and real network conditions, but demands comfort with terminals, build environments, and IDEs.
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