[BUG] Graphs not shown when using Mozilla Firefox

[Nitrouze]

Describe the bug Hi, It seems there's a incompatibilty with Mozilla Firefox which shows empty graphs on,at least, some Apple plateform (MacOS, IOS...).

To Reproduce Steps to reproduce the behavior:

1. Create a fresh dashboard like this ...
   views:
   • title: Home cards:
     • type: custom:energy-period-selector-plus
     • type: energy-usage-graph
2. Check result with different web browser
3. Both, Mozilla Firefox on MAC OS and Mozilla Firefox on iPhone are showing empty graphs.
4. Other web browser i've tested are working fine (ie: Safari on MacOS, Homeassitant mobile application on iPhone ...)

Expected behavior Graphs should be dispayed by Mozilla Firefox

Desktop (please complete the following information):

• OS: MacOs BigSur
• Browser Mozilla Firefox
• Version 116 (latest as today)

Smartphone (please complete the following information):

• Device: IPhone
• OS: iOS 15.7
• Browser Mozilla
• Version 115.1

Additional context I've cleared the cache on all browsers several times but it does not change the behaviour.

Please make sure all of this applies and check the checkboxes, by writing "X" inside of them.

• [X] I understand that this is a channel for reporting bugs, not a support forum (If you need help configuring the card, go to: Discussions).

• [X] I have the latest version of the card installed.

• [X] I have cleared my browser cache after installing, updating and configuring the card.

[Nitrouze]

Maybe I was too fast posting this bug report.

I had to wait around 30mins without editing the dashboard and then graphs shows up normally. I assume there is a delay after editing a dashboard before Firefox loads the data.