The application pop-up / option bar doesn't appear in Fanbox

[bempfoobq052021]

tl;dr There's no option to download from Fanbox images for some reason (it's still there a few days ago, I think, which is a few days after manifest v3 update)

The bug
The option bar at the bottom of my screen is now gone.

Expected behavior
There should be a small option bar near the bottom of my screen.

Example work from Pixiv
It works in Pixiv, but not in Fanbox.

Browser and Version (please complete the following information):
Google Chrome Ver. 127.0.6533.120 (Official Build) (64 bit)

Settings of extension
Language: English
Activate download panel automatically : Yes
Download panel position : Center
Download panel style : Type 1
Show reload in extension popup page : Yes
Here's a screenshot of my settings.

Additional context
I've been downloading from Pixiv after manifest v.3 update so I didn't notice the change in Fanbox. There's an addiional system error though: I can't change the Fanbox Download Task Settings because the option reverts to the default after I close or reload the page.

[cyxceven]

I have the same issue. No download bar at the bottom of the screen for Fanbox. It still works on Pixiv.
Using Microsoft Edge Version 128.0.2739.67 (Official build) (64-bit)

[leoding86]

I can't reproduce the issue. If you can install unpack extension manually, you can try the latest version in release page.

[Fraetor]

I have this issue with v5.5.3 on Firefox. Does this extension still support installing on Firefox? I couldn't get the linked version to install, with an error: background.service_worker is disabled.

[Fraetor]

Looking at the dev tools, it is failing to parse some JSON somewhere.