1720623 - fetch useless favicon with link shortcut icon customization there

Status: NEW

(Firefox :: Tabbed Browser, defect)

Description

[John Hu [:johnhu][:johu][:醬糊小弟]]

Attachment: Screen Shot 2021-07-15 at 11.50.50.png

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36

Steps to reproduce:

1. create 2 web pages (linked each other) with customized favicon tag, <link rel="shortcut icon" href="favicon.production.ico">
2. serve these pages
3. open the page 1 and click link to page 2
4. open developer tools -> network tab
5. press browser native backward button
6. check network tab to find two network access:

• favicon.ico
• favicon.production.ico

Actual results:

Firefox tries to make two fetches:

1. favicon.ico
2. favicon.production.ico

The first one is useless and makes a 404 request to the web server.

Expected results:

Firefox tries to make one fetch:

1. favicon.production.ico

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::DOM: Networking' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Comment 2

[Kershaw Chang [:kershaw]]

The fetch request was triggered by FaviconLoader.jsm, so change the component to Tabbed Browser.

Comment 3

[Peter Magyari (Desktop QA)]

I'm not entirely sure but I believe this might be a duplicate of Bug 685740