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Original file line number Diff line number Diff line change
Expand Up @@ -413,6 +413,11 @@ def system_prompt(self) -> str:
and re-check before concluding.
- If you confirmed that the reported broken behaviour reproduces in both browsers,
set `failure_reason` to `not_firefox_specific`.
- NOTE: Reports about the site steering users away from Firefox (a
"use Chrome" recommendation, an unsupported-browser warning, or a
user-agent-based block) are considered valid web compatibility issues even
if the same message displayed in Chrome. Seeing that message in Firefox
is the reproduction: set `reproduced` to true.
4. If the issue reproduces, write and run a Puppeteer script that drives the real
reported site in both browsers and demonstrates the difference: follow the spec in
`{repro_reference}`, write your script to exactly `{self.script_path}`
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,20 @@ some or all of a website, or which would cause the website to look or
behave noticeably different or worse in Firefox compared to other
browsers.

A site that steers users away from Firefox is a webcompat issue even if
the page otherwise renders and works identically in every browser. This
includes:

- Telling users to switch to, or that the site is best viewed in, another
browser (e.g. "it is recommended to use Chrome").
- Warning that Firefox is unsupported, or that some feature will not work
in Firefox.
- Blocking Firefox outright, or serving it a degraded/legacy experience,
based on user-agent sniffing.

Treat these as webcompat - the recommendation or block is itself
the issue to report.

Issues with the browser UI are not webcompat issues unless they
specifically affect the ability to access content on a specific site.

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