I'm having trouble with reliability with this extension.
1) The extension does not list all of the themes I have installed. For example, I have a theme called "Strive" installed from the Firefox Browser Add-Ons website, but it's not reliably displayed in the list by this extension. Sometimes it's available to select, other times it is not.
2) The extension lists themes in a seemingly random order. About 4/5 of the way through the list, there's a line break separating about 6 themes from the rest. Why is this divider there? I have no idea. Ideally, themes should be displayed in alphabetical order by default with the option to customize the list's order.
3) When hovering my mouse over the list of themes displayed by the extension normally causes the browser to preview the theme I'm hovering over. However, it's very easy to get into a situation where the preview is no longer displayed as I hover over additional themes. I have to close the extension's pop up and re-invoke it to try to get the preview function to work again.

I love the functionality this extension provides, but it's frustrating how often these hiccups show up.

I liked it but I wish I could cycle through a select group of themes.

Essential if you like to use a bunch of different themes.

Would be nice if it could also have some sort of scheduler, so instead of just rotating themes on each launch, you could define a specific 'playlist' to be used say for day vs night, or for different months.

wheres adachi?

Thanks for this extension!
To hide a bunch of new themes imposed by Mozilla, you need to create the browser.theme.colorways.enabled parameter (logical, false) and restart the browser.

I am amazed at the very useful and unique features.

Taking into account the knowledge of the developers, I thought about the following.
The Chrome Extensions web store has the following extensions:

https://chrome.google.com/webstore/detail/simpleextmanager/kniehgiejgnnpgojkdhhjbgbllnfkfdk

Add-ons like this,
Can you create it as a Firefox version of Extension Shortcut Manager?

I want to ask you.

Currently in the Chrome Web Store.
I think this is the only add-on that doesn't exist in the Firefox web store.

This is one of the biggest reasons to hesitate to use Firefox on a regular basis.

I thought it might be possible with the knowledge of the developer.

Thank you.

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It's an honor just to see it.

I'm not a programmer, But
Personally, I learned a little JavaScript for efficiency.

It's ridiculously difficult.

I think the developers who are visibly active are great.

EDIT: Thanks for the Alpenglow fix!!!

I've been using this extension for a while now and it works beautifully!

I love this extension. It makes me happy. The only thing that would be better, would be a way to maybe checkmark certain ones to rotate from, so that I'm not rotating all my off seasons, christmas, fall, winter, etc, in summer. Thanks developer!

Best automatic theme changer for ages if you like to have many different themes automatically switched :)

I have 2 scrollbars instead of 1.

Works fine since years, the only and the best addon for the required task.

Optionrequest:
Would it be possible to add the feature to create a list of all installed themes to be able to copy the list into the clipboard. I would like to archive the list of managed themes in case of browser or system crashes.

I no longer use Firefox. Instead I use Waterfox Classic which is very similar to Firefox 56 due to the fact that I despise what Mozilla had done to FF over the years. I would like to continue to use this extension, however it is a hassle having to sit and wait for WF to unhang every time it switches themes (this happens because I have a sheer amount of themes I've collected over the years since their inception), plus the default shortcut Cntrl+Alt+A interferes with the Colorful Tabs extension so it will not work since you did not make it possible to set a custom shortcut in the options. Waterfox Classic DOES NOT have the "MANAGE EXTENSION SHORTCUTS" option since it is basically a clone of Firefox 56 so I can't do that. I will be sticking with the old 4.0.5 version of Personas Switcher until it is made fully compatible with Waterfox Classic.

Please do not discontinue. I love my personas and would be glad to pay for this extension to be able to make my firefox pretty. The personas is making Firefox beautiful to use. This customization feature is only available here in Firefox and is the only reason I HAVE USED FIREFOX SINCE 2011.

Lovely.