Content bug: "Mixed content" not Fx-agnostic and/or with obsolete screenshots

[SphinxKnight]

What page(s) did you find the problem on?

https://developer.mozilla.org/en-US/docs/Web/Security/Mixed_content
https://developer.mozilla.org/en-US/docs/Web/Security/Mixed_content/How_to_fix_website_with_mixed_content

Specific page section or heading?

For the first page: https://developer.mozilla.org/en-US/docs/Web/Security/Mixed_content#warnings_in_firefox_web_console
For the second an overall update would be beneficial.

What is the problem?

The pages are not browser agnostic and present specific Firefox information. Moreover the provided screenshots are now obsolete.

What did you expect to see?

Browser agnostic wording and/or information.

Did you test this? If so, how?

NA

[wbamberg]

They are also out of date, as the spec no longer talks about "passive" and "active" content, but about "upgradeable" and "blockable" content.