WebExtensions Experiements have many similarities to traditional add-ons, therefore a lot of general documentation is already available on developer.mozilla.org. The following questions and answers are specific to WebExtensions experiments and should help you with common issues.
Can I include a chrome.manifest in an experiment?¶
The experiments do not support the ‘chrome.manifest’, and it will be ignored if
included in the experiments add-on source directory. If you need an URI which
points to assets packaged within the experiment (e.g. an image, an additional
.jsm file, a frame script, etc.), you can register a path with the
resource: protocol handler.
If you have any more questions you can’t find an answer to please get in touch.