HTerr
Supports 
Pale Moon [25.0a1pre - 28.*]. NOTICE: The Browser you're using may not be supported by HTerr. If you believe this to be in error, please check your browser's User Agent settings. ✉️ E-Mail the Developer 📑️ Issues🐛️ 
Browse Source Code
⚖️ Public Domain
HTerr is free software supported by donations, not advertisements.
If you find this software useful, please support it!
💸 Make a Donation
Welcome to the HTerr home page! This extension adds fallback error pages for websites that return HTTP errors with no content.
HTerr was just created in September of 2020, after Mozilla Firefox and Thunderbird had already converted to WebExtension standards, and was created specifically for Pale Moon.
HTerr is
free for use or modification without limitation. However, it comes with no license, warranty, or guarantee of any kind. That being said, you can still
ask any questions in the
Comments section below, or
contact me directly for assistance.
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Pale Moon [25.0a1pre - 28.*]. NOTICE: The Browser you're using may not be supported by HTerr. If you believe this to be in error, please check your browser's User Agent settings.
Browse Source Code
⚖️ Public Domain