Hello Fox, The first time I visited the site, I had to click once on the map for the scrollwheel to work

Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache. Note: This will temporarily log you out of all sites you're logged in to. To clear cache and cookies do the following:

1. (Firefox 57 and above) Click the Library button and choose History.
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2. In the History menu, choose "Clear Recent History...".
3. Under "Time range to clear", select "Everything".
4. Now, click the arrow next to Details to toggle the Details list active.
5. From the details list, check Cache and Cookies and uncheck everything else.
6. Now click the "Clear Now" button.

Further information can be found in the Delete browsing, search and download history on Firefox article.

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Thank you.

Thanks. After reading your comment that was saying that it worked, I tested it a little bit more. On a new system, mouse wheel worked on that site with FireFox.

I have found that the "Logitech Smooth Scrolling" extension is causing that problem. If I enable that extension, mouse wheel zoom does not work on the Kakao Map.

I'm glad to hear that you solved your issue.

You can contact Logitech about the problem with their extension here: https://support.logi.com/hc/en-us