Is there a way to downgrade version?

I don't like to restore a backup, because in the time with 2.5.2 I have included quite a few articles, where I didn't need any options and therefore didn't know that it doesn't work with Firefox anymore.
If I restore a backup now, I will lose all the hours I spent adding these articles.

I don't think there is an option to downgrade versions.

Maybe you could export products via CSV then do a backup of 2.5.1 and import products back from your CSV?

Thanks for the suggestion.
I'll try whether my knowledge is enough for this and whether I can find out if then actually all the information of the products are in it.
I am not clear, for example, whether then in the csv all articles are and what happens when I import them again, if then the already existing in the backup are doubled or whether this is similar to FileZilla where only the data are made that are missing.

Keep in mind that product options will not be exported to CSV.

To manually go back to 2.5.1 simply replace the complete set of application files and reverse any changes made by the upgrade patches for 2.5.2.

https://github.com/litecart/litecart/tree/dev/public_html/install/upgrade_patches

May I ask why you need to downgrade?

Thanks, will try tomorrow if I can handle it.

I need the downgrade, because with 2.5.2 I can't do any options for articles with my Firefox (and also [b]all[/b] addons turned off). Works not even in the demo store.
With Brave or Edge it would work, but I just don't want to use a Chromium-based browser. I've been happy with my FF for at least 15 years.

By articles, do you mean products or news articles?

Is your problem by any chance related to this issue topic?:
https://www.litecart.net/en/forums/15/errors-and-troubleshooting/18367/adding-stock-options-to-products-not-working

In that topic we resolved a problem with options and firefox.

It seems to be a very similar problem, as far as I understand the linked post. But my problem, that I can't set any predefined options in the products, started after the 18.2. and there you had, if I see it correctly, already fixed the problem raised by Vim.
Since I had with 2.5.1 no problems and now already over a week no more products can admit, my idea was evenly to go back to the previous version. But does not work properly either, as you can see.

Can you reproduce your problem in the demo?
If yes, can you provide instructions how we can reprocude it?

https://demo.litecart.net/

I hope my picture shows what I mean, I can't choose a color or add the option. Now in this case I used my FF 110 normally, but the last time I tried I intentionally turned off all addons to rule them out as the cause.

That is exactly the problem that was referenced with a fix in that other forum topic. Try it out. If it doesn't work, see if it is reproducable in the demo.

I read the post but wouldn't know what to do with the "fix jquery selector" part mentioned.
First of all, I do not think I can change anything in the demoshop and from that is also the image attached again today that you can not select a color?

Replace your admin/catalog.app/edit_product.inc.php file content with one from this link:
[url=https://github.com/litecart/litecart/blob/dev/public_html/admin/catalog.app/edit_product.inc.php]https://github.com/litecart/litecart/blob/dev/public_html/admin/catalog.app/edit_product.inc.php[/url]

It's a fix for 2.5.2. Product options and attributes works with Firefox again.

Thank you very much. I have replaced this file as suggested. But I would have been surprised if it would have been of any use, because I can't add any options in the demo store either. Neither in my nor in the demo store go to set the option. When I try to set an option, the little blue Windows circle keeps spinning.
Firefox has updated itself today to 110.0.1, so it is certainly up to date.
I turned off all addons to try, cleared FF cache, also set clear cache in backstore, restarted FF, all doesn't help.
Really peculiar mistake, especially if he is now gone in your case.
I really do not know what else I could try.

I discovered some more fields having the same problem with Firefox as the previous commit addressed.

Grab this whole file again:
https://raw.githubusercontent.com/litecart/litecart/dev/public_html/admin/catalog.app/edit_product.inc.php

Great, thanks it works again.
Finally I can continue to work on my store.
Could now 10 days nothing enter, because useless. Almost all products in my house have either different colors or lengths or both.

Drop the arrogance. You could have just swapped browser to solve the crisis.

I dedicated time to look into this matter. I listened to your description of the problem. I addressed an issue. I provided a fix.
In return you just like telling me things were useless for 10 days? There is nothing that satisfies you, is there?

Sorry I'm afraid you completely misunderstood my comment. I just wanted to express my happiness that the problem is over and just mentioned that unfortunately I couldn't work with it for 10 days because of that.
I would never criticize you, because I have never seen an IT professional work and therefore do not really know how the work goes, but I suspect that there is a lot of work in it for many years and, except for a few modules, that does not even cost money.
So I apologize again if you felt offended by my careless phrasing.