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Mozilla Accessibility on Unix/Linux Web Accessibility (A11y) has been developed in recent years. Till recent days, no web browser on Unix/Linux has A11y support. This means the powerful Unix and the free Linux operating system is unusable by the disabled. People who had a computer, but could not afford $500 for Microsoft Windows, were unable to use his computer. This was the problem we were trying to address by adding A11y support into Mozilla on Unix/Linux. Mozilla was chosen because it’s the most important open source cross-platform web browser and the dominant web browser on Unix/Linux. Although Mozilla is designed to be cross-platform, A11y support is platform-specific. This paper addresses how we solved the problem of architecting A11y support for Mozilla on Unix/Linux