The following tests are only failing in Firefox as documented in https://foolip.github.io/ad-hoc-wpt-results-analysis/firefox-lone-failures.html /referrer-policy/generic/multiple-headers-and-values.html /referrer-policy/generic/multiple-headers-combined.html /referrer-policy/generic/multiple-headers-one-unknown-token.html /referrer-policy/generic/multiple-headers.html /referrer-policy/generic/subresource-test/image-decoding.html /referrer-policy/generic/unsupported-csp-referrer-directive.html /referrer-policy/no-referrer-when-downgrade/attr-referrer/cross-origin/http-http/img-tag/no-redirect/insecure-protocol.http.html /referrer-policy/no-referrer-when-downgrade/attr-referrer/cross-origin/http-http/img-tag/swap-origin-redirect/insecure-protocol.http.html /referrer-policy/no-referrer-when-downgrade/attr-referrer/cross-origin/http-https/img-tag/keep-origin-redirect/upgrade-protocol.http.html /referrer-policy/no-referrer-when-downgrade/attr-referrer/cross-origin/http-https/img-tag/swap-origin-redirect/upgrade-protocol.http.html /referrer-policy/no-referrer-when-downgrade/attr-referrer/same-origin/http-http/img-tag/keep-origin-redirect/insecure-protocol.http.html /referrer-policy/no-referrer-when-downgrade/attr-referrer/same-origin/http-http/img-tag/no-redirect/insecure-protocol.http.html /referrer-policy/no-referrer-when-downgrade/attr-referrer/same-origin/http-https/img-tag/keep-origin-redirect/upgrade-protocol.http.html /referrer-policy/no-referrer-when-downgrade/attr-referrer/same-origin/http-https/img-tag/no-redirect/upgrade-protocol.http.html /referrer-policy/no-referrer-when-downgrade/attr-referrer/same-origin/http-https/img-tag/swap-origin-redirect/upgrade-protocol.http.html /referrer-policy/no-referrer-when-downgrade/http-rp/cross-origin/http-http/img-tag/keep-origin-redirect/insecure-protocol.http.html 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/referrer-policy/origin-when-cross-origin/http-rp/same-origin/http-https/img-tag/no-redirect/same-origin-upgrade.http.html /referrer-policy/origin-when-cross-origin/http-rp/same-origin/http-https/img-tag/swap-origin-redirect/same-origin-insecure.http.html /referrer-policy/origin-when-cross-origin/http-rp/same-origin/http-https/img-tag/swap-origin-redirect/same-origin-upgrade.http.html /referrer-policy/origin-when-cross-origin/meta-referrer/cross-origin/http-http/img-tag/keep-origin-redirect/cross-origin.http.html /referrer-policy/origin-when-cross-origin/meta-referrer/cross-origin/http-http/img-tag/no-redirect/cross-origin.http.html /referrer-policy/origin-when-cross-origin/meta-referrer/cross-origin/http-http/img-tag/swap-origin-redirect/cross-origin.http.html /referrer-policy/origin-when-cross-origin/meta-referrer/cross-origin/http-https/img-tag/keep-origin-redirect/cross-origin.http.html /referrer-policy/origin-when-cross-origin/meta-referrer/cross-origin/http-https/img-tag/no-redirect/cross-origin.http.html /referrer-policy/origin-when-cross-origin/meta-referrer/cross-origin/http-https/img-tag/swap-origin-redirect/cross-origin.http.html /referrer-policy/origin-when-cross-origin/meta-referrer/same-origin/http-http/img-tag/keep-origin-redirect/same-origin-insecure.http.html /referrer-policy/origin-when-cross-origin/meta-referrer/same-origin/http-http/img-tag/no-redirect/same-origin-insecure.http.html /referrer-policy/origin-when-cross-origin/meta-referrer/same-origin/http-http/img-tag/swap-origin-redirect/same-origin-insecure.http.html /referrer-policy/origin-when-cross-origin/meta-referrer/same-origin/http-https/img-tag/keep-origin-redirect/same-origin-downgrade.http.html /referrer-policy/origin-when-cross-origin/meta-referrer/same-origin/http-https/img-tag/keep-origin-redirect/same-origin-upgrade.http.html /referrer-policy/origin-when-cross-origin/meta-referrer/same-origin/http-https/img-tag/swap-origin-redirect/same-origin-downgrade.http.html /referrer-policy/origin-when-cross-origin/meta-referrer/same-origin/http-https/img-tag/swap-origin-redirect/same-origin-insecure.http.html /referrer-policy/origin/http-rp/cross-origin/http-http/img-tag/no-redirect/generic.http.html /referrer-policy/origin/http-rp/cross-origin/http-http/img-tag/swap-origin-redirect/generic.http.html /referrer-policy/origin/http-rp/cross-origin/http-https/img-tag/keep-origin-redirect/generic.http.html /referrer-policy/origin/http-rp/cross-origin/http-https/img-tag/no-redirect/generic.http.html /referrer-policy/origin/http-rp/cross-origin/http-https/img-tag/swap-origin-redirect/generic.http.html /referrer-policy/origin/http-rp/same-origin/http-http/img-tag/keep-origin-redirect/generic.http.html /referrer-policy/origin/http-rp/same-origin/http-http/img-tag/no-redirect/generic.http.html /referrer-policy/origin/http-rp/same-origin/http-http/img-tag/swap-origin-redirect/generic.http.html /referrer-policy/origin/http-rp/same-origin/http-https/img-tag/keep-origin-redirect/generic.http.html /referrer-policy/origin/http-rp/same-origin/http-https/img-tag/no-redirect/generic.http.html /referrer-policy/origin/http-rp/same-origin/http-https/img-tag/swap-origin-redirect/generic.http.html /referrer-policy/origin/meta-referrer/cross-origin/http-http/img-tag/keep-origin-redirect/generic.http.html /referrer-policy/origin/meta-referrer/cross-origin/http-http/img-tag/no-redirect/generic.http.html /referrer-policy/origin/meta-referrer/cross-origin/http-https/img-tag/keep-origin-redirect/generic.http.html /referrer-policy/origin/meta-referrer/same-origin/http-http/img-tag/keep-origin-redirect/generic.http.html /referrer-policy/origin/meta-referrer/same-origin/http-http/img-tag/no-redirect/generic.http.html 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/referrer-policy/same-origin/meta-referrer/same-origin/http-http/img-tag/no-redirect/same-origin-insecure.http.html /referrer-policy/strict-origin-when-cross-origin/attr-referrer/same-origin/http-http/img-tag/keep-origin-redirect/same-insecure.http.html /referrer-policy/strict-origin-when-cross-origin/attr-referrer/same-origin/http-http/img-tag/no-redirect/same-insecure.http.html /referrer-policy/strict-origin-when-cross-origin/http-rp/cross-origin/http-http/img-tag/keep-origin-redirect/cross-insecure.http.html /referrer-policy/strict-origin-when-cross-origin/http-rp/cross-origin/http-http/img-tag/no-redirect/cross-insecure.http.html /referrer-policy/strict-origin-when-cross-origin/http-rp/cross-origin/http-http/img-tag/swap-origin-redirect/cross-insecure.http.html /referrer-policy/strict-origin-when-cross-origin/http-rp/cross-origin/http-https/img-tag/keep-origin-redirect/upgrade-protocol.http.html 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/referrer-policy/unset-referrer-policy/http-rp/same-origin/http-https/img-tag/swap-origin-redirect/upgrade-protocol.http.html /referrer-policy/unset-referrer-policy/meta-referrer/cross-origin/http-http/img-tag/no-redirect/insecure-protocol.http.html /referrer-policy/unset-referrer-policy/meta-referrer/cross-origin/http-https/img-tag/no-redirect/upgrade-protocol.http.html /referrer-policy/unset-referrer-policy/meta-referrer/same-origin/http-http/img-tag/keep-origin-redirect/insecure-protocol.http.html /referrer-policy/unset-referrer-policy/meta-referrer/same-origin/http-http/img-tag/no-redirect/insecure-protocol.http.html /referrer-policy/unset-referrer-policy/meta-referrer/same-origin/http-http/img-tag/swap-origin-redirect/insecure-protocol.http.html /referrer-policy/unset-referrer-policy/meta-referrer/same-origin/http-https/img-tag/swap-origin-redirect/upgrade-protocol.http.html

Thomas, whenever you get a chance, can you take a look and provide an update why so many of the referrer wpt tests are failing?

Thanks, most of them are falling in img-tag. There's is an old bug that python version in try machine is not compatible to run wpt img tag test. I am checking if it's fixed or we have problem with image referrer policy

https://bugzilla.mozilla.org/show_bug.cgi?id=1265864 That is the bug, and I see the python version bug https://bugzilla.mozilla.org/show_bug.cgi?id=1266240 is marked as won't fix. I will take a look at this old bug to see if we have any progress

(In reply to Thomas Nguyen from comment #3) > https://bugzilla.mozilla.org/show_bug.cgi?id=1265864 > That is the bug, and I see the python version bug > https://bugzilla.mozilla.org/show_bug.cgi?id=1266240 is marked as won't fix. > I will take a look at this old bug to see if we have any progress Jordan, Andrew, I see both of you have been involved in the two bugs above. Is there anything we can do to make those referrer tests run on our test machines? It seems they are all related to img-tag. It seems we would like to get them running, is there anything we could do in your opinion?

I think the Python 2.11 bug doesn't apply now since it's about buildbot and we're running on TaskCluster. Locally I definitely have a recent enough Python installed and I still see the tests failing, so I think there must be something else here.

I see, thanks Jame, I will take a closer look

Thanks for pointing it out, I did not follow the img tag issue for a while. I took a look at this and it is not an issue in img loading itself. Img loading followed referrer policy correctly, but the referrer policy is not inherited correctly from parent doc to iframe. A new test was added https://github.com/web-platform-tests/wpt/commit/39cbd1fb20f9febd40460725c8837e3175b662e9 That is an image loading in iframe. If the iframe has no referrer policy itself, it should inherit referrer policy from parents. But in FF, we do not have this inheritance and seems to use default instead. We had a bug doing this (assigned to bz) https://bugzilla.mozilla.org/show_bug.cgi?id=1265961 and probably we could fix the referrer policy inheritance part separately.

Correct link: https://github.com/web-platform-tests/wpt/commit/7aefca1efd9fe8ed018849e5d4dbae57ea81ce27 (In reply to Thomas Nguyen from comment #7) > and probably we could fix the referrer policy inheritance part separately. The image tag tests and iframe inherance tests are put into together. So in order to enable these tests, we have to fix the iframe inheritance referrer policy. And also the referrer URI needs to be fixed (as I can see we use about:srcdoc as referrer)