Windows 10: Customizing a program's taskbar icon (for all instances)

I want to customize the icon of a certain program (in this case Firefox). There are many instructions on how to supposedly achieve this by e.g. simply going to any shortcut (in Explorer or Desktop), Properties, Change Icon. Then pinning this shortcut to taskbar puts the customized icon there. But as soon as you click that icon, it loads a new instance and the new instance has the "real" icon. And the customized icon just sits there taking up space. I have no idea why Microsoft has intended it like that, it makes no sense to me.

Is there some way to change the icon so that all instances of the program show the customized icon?

I tried Resource Hacker. I remember I've been successful with that many years ago with some program. However, for Firefox, there is some problem. It seems that all programs have a different set of icons. Like 16, 256, 16.8M color icons, different sizes etc. For Firefox, I'm not sure if I'm creating exactly the right kind of .ico group icon. Whatever the reason is, if I replace the icons with Resource Hacker, Firefox won't launch anymore (nothing happens).

:)

 

System Icons on taskbar

Hi,

Thank you for posting on Microsoft Communities.

Are you referring to the clock system icon on the taskbar?

If so, I suggest you to follow the steps mentioned below:

• 
  Click on the search bar on the taskbar.
  
• 
  Type system icons.
  
• 
  Under Turn System Icons ON or OFF, turn On the Clock and check with the issue.
  

Hope it helps.

 

can't open new instances of an application from taskbar

I have any program open. I right click the shortcut for it in the taskbar and a list of option comes out. But then when i try to open another instance of the program from that list by clicking on the option with the icon and program name, nothing happens.
How do I make it so that it opens another instance instead of doing nothing?

 

GPU-Z Program Icon Submission

Suggestion to have an option to change Notification Area icon this way too.
Suggestion to finally have proper separate Options window like most (all?) Windows programs do.