I'm not seeing in Firefox (85.0) what your screenshot shows.
I've loaded your gallery's web page in Chrome, Edge and Firefox and I see the same gallery layout (with thumbnail dots) in all browsers.
It looks to me like it might be a browser caching issue (with your Firefox browser using an older, cached version of your gallery's 'config.xml' file).
Try completely clearing your Firefox browser's cache before reloading your gallery's web page to see if this helps.

Just a short note to let you know that allowing the Shopping Cart Icon (and thus Fotomoto) to appear in Small Screen Mode is on the 'to do' list (although I do not know when it might be implemented).

Thanks, Derek!
Not that it matters (now that you've posted the updated link) but I've changed the link in my post above. (No point having an incorrect link in a post!)

This is most likely due to the gallery not having focus on the web page until you click somewhere within it.
After loading the web page, try clicking a blank area in the gallery before clicking the navigation button.

If this works and you want to give the gallery focus as soon as your web page loads, then try using the following as your gallery's embedding code (changing the background color and gallery dimensions as necessary).

<script src="jbcore/juicebox.js"></script>
<script>
    var jb = new juicebox({
        backgroundColor: "#222222",
        containerId: "juicebox-container",
        galleryHeight: "400",
        galleryWidth: "100%"
    });
    jb.onInitComplete = function() {
        $('.juicebox-gallery').first().trigger('focus');
    };
</script>
<div id="juicebox-container"></div>

(onInitComplete is a Juicebox-Pro API event which is documented here.)

That's great news!
Thank you very much for posting back to let me know.
It's great to know that there is now a version of AIR that can easily be installed on Big Sur.
I wish you well with Juicebox-Pro and your web projects!

Harman have just released their AIR runtimes (v33.1.1.385).
Here is their download page: https://airsdk.harman.com/runtime

Please read the Known Issues regarding these runtimes (on the download page below the links).
Here are the Known Issues which are relevant to JuiceboxBuilder.

I have tested the Windows runtime on Windows 10 and, other than being presented with the "unknown" publisher warning, it works fine. (I was able to successfully install and run both JuiceboxBuilder-Lite v1.5.1 and  JuiceboxBuilder-Pro v1.5.1.)
Unfortunately, I do not have access to a Mac to test the Mac version.

I hope this helps you to get both AIR and JuiceboxBuilder-Pro up and running on Big Sur.
Please let me know how you get on.
Thank you.

Still no news of a Harman AIR runtime, I'm afraid, but the Gamua Github account has just opened a Discussions page in the Adobe-Runtime-Support repository (a few days ago) which might be worth keeping an eye on.
https://github.com/Gamua/Adobe-Runtime- … iscussions

Juicebox-Pro supports only one audio track so if you want a whole album to be played, you'd need to merge all the tracks into one.

Having said that, the audio should start playing as soon as the Audio Button is clicked, without the need to wait for the entire mp3 file to be downloaded in its entirety first.
I've just checked this in a test gallery on my own web server using with an 83MB mp3 file in a couple of browsers (Edge and Firefox) and it works fine.

It should also be noted that, due to recent browser restrictions, it is no longer possible to automatically start the audio playing as soon as the gallery loads in all browsers.
When Juicebox-Pro was first released, it was possible to autoplay audio on loading a gallery by setting playAudioOnLoad="TRUE" (in the Audio Options).
However, fairly recently, certain desktop browsers (including Chrome and Firefox) have started to block the autoplay of audio (and video) by default.
Users now need to initiate the playing of audio (and video) files themselves.
In the case of a Juicebox-Pro gallery, users now need to click the Audio Button (on the gallery's Button Bar) to start audio playing.
I have just checked my own installed browsers a few minutes ago and playAudioOnLoad continues to work only in Microsoft Edge and Opera.

Here are the release notes for Firefox 66 where this change of behavior was first noted: https://www.mozilla.org/en-US/firefox/6 … easenotes/
Here are similar notes for Chrome: https://developers.google.com/web/updat … cy-changes

As unfortunate as it is, there is nothing that can be done from within Juicebox-Pro to force audio to autoplay in browsers which feature these audio/video restrictions.
Users will likely have the option of changing their browser's settings (depending on the browser) to allow autoplay of audio (and video) but this is something that the user must do. (A user's browser settings cannot be changed from within a Juicebox gallery.)

However, as long as you display the Audio Button on your gallery's Button Bar (by setting showAudioButton="TRUE"), then users can start the audio track themselves by clicking the button.

Juicebox-Lite has an image limit of 50 images. All 47 of your gallery images should display fine.

The problem is most likely to be an issue with the 34th image in your gallery (either a missing or corrupt file on the web server) or an issue with the gallery's 'config.xml' file.
Please double-check that the 34th image is present in the correct location on your web server.
Also, try opening the gallery's 'config.xml' file directly in your browser and, if there is an error in the XML syntax, the browser should let you know what the error is and at what line in the file the error occurs.

If you continue to experience difficulties, then please post back with a link to your gallery's web page so that I can see the problem for myself.
Once I'm able to see the problem live on your web server, I should hopefully be able to determine the exact cause of the problem and propose a solution.
Thank you.

I'm sorry that you're still having trouble.
Did you fully uninstall any existing version of Adobe AIR before trying to install v20? If not, then that might help.
Otherwise, we might have to wait patiently and hope that Harman releases a runtime soon that resolves your problem.
Thank you for your patience.

Have you found and tried Adobe AIR v20.0 yet? As I mentioned previously, it seems to have worked for another Big Sur user.

I'll certainly post back here when I have any further news of a Harman AIR runtime (and, as long as you subscribe to this topic,  you will receive an email notification to signify that there is a new post in this thread).

Also, keep an eye on these Adobe AIR pages.
Adobe AIR Forum: https://community.adobe.com/t5/air/bd-p … filter=all
Adobe Runtime Support Issues: https://github.com/Gamua/Adobe-Runtime-Support/issues
Harman AIR Website: https://airsdk.harman.com/

Take a look at the posts in the Adobe AIR Forum (first link above).
Search for "framework damaged" and you'll find many people encountering the problem that you reported.
Maybe I've missed something and reading through all the relevant posts will provide a new suggestion.

Also, check out all the tips in this forum post.
There might be something there that helps. You might read about something that you are not doing (that I do not know about) which might help.