The web page does not open when one click on the icon.

It doesn't work on Brave browser either ...

Hey sundit! Unfortunately, we can’t click on any links on the forum, due to security reasons. 

If you want though, you can attach a screenshot here by clicking on the small camera icon above your message box (right before you post).

I got the same problem on Ubuntu 22. I think the problem is due to Firefox snap-installation.
Take a look at: https://ubuntuforums.org/showthread.php?t=2478275

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bi3mw wrote:

Now is this primarily a Dropbox problem or a Firefox problem ?

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All Dropbox does is save a file to your local drive and tells your computer to open it. It has no control of the process beyond that. I'd point to Firefox ESR being the issue, since it's working as expected in Chrome, and not Dropbox.

Side note, it works fine in Firefox (not ESR) on Windows.

Now is this primarily a Dropbox problem or a Firefox problem ?

I don't know if it's the same on Linux, but on Windows that icon doesn't directly open the Dropbox website. When you click the icon a file is saved to your local temp folder and then that file is opened in your browser, which then redirects to the Dropbox website.

Assuming the Linux client works the same way, could something be preventing Dropbox from writing the local file before trying to open it in the browser?

My default browser is: Firefox 115.2.1esr (64-bit)

No, nothing happens even if the browser is already open.

Hi bi3mw, what is your default browser on your machine? If you have the browser open in general, and then click the link in the Dropbox icon, does the Dropbox site load?

If I type the address of Dropbox directly into the address bar of the browser I can access Dropbox.