Prestashop: Missing app_icon.png on BO - Firefox browser

[Klemart3D]

Describe the bug
On fresh install of PS 1.7.6.0 is missing app_icon.png image on back-office:

File is called on default admin theme:
https://github.com/PrestaShop/PrestaShop/blob/develop/admin-dev/themes/new-theme/template/header.tpl#L31

But no file exists in img/ folder:
https://github.com/PrestaShop/PrestaShop/tree/develop/img

Does this file is really necessary? If yes, why it doesn't exists and why it can't be uploaded from BO?

Additional information
PrestaShop version: 1.7.6.0
PHP version: 7.2

[khouloudbelguith]

Hi @Klemart3D,

In which page from the BO, the error in the console is displayed?
In my case, there is no 404 error in the Network tab.

Thanks!

[Klemart3D]

Every page of BO, included dashboard (I tried on another instance of PS and I get the same):

Do you have no request to app_icon.png or your request is successful (200 code)?

[khouloudbelguith]

@Klemart3D,

No, I don't have any requests for the app_icon.png.
I attached a screen record
https://drive.google.com/file/d/1fELVQ8YhjtzIVIr3j5BWUjO37D4aa5_d/view
Thanks to check & feedback

[Klemart3D]

You're on Chrome? I tried with Chrome v.75 on Linux and you're right: no request to app_icon.png found.
Error seems only appears on Firefox (I'm on v.68)

[khouloudbelguith]

@Klemart3D, yes, you are right.
I manage to reproduce the issue with PS1.7.6.0 & PS1.7.5.2 using the browser Firefox v64.0.2.

I’ll add this to the debug roadmap so that it’s fixed. If you have already fixed it on your end or if you think you can do it, please do send us a pull request!
Thanks!

[evgenij-sobolev]

The same problem on Presatshop 1.7.6.4 and Firefox 74