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Often (though not always) Firefox will prompt me to "Make Firefox your default browser" when first run or when run after being closed, despite me clicking "Set as default browser".

According to "KDE Settings / Default Applications", Firefox ESR is the default web browser and the default file association for HTML files. Firefox and Chromium (and I presume Konqueror) are installed. A similar laptop with similar software on it does not exhibit the problem.

What is Firefox actually checking to determine whether it needs to ask "Set as default browser"?

When I go to Settings - Cookies and Site Data - Manage Data, it doesn't show all websites that have stored data. Even including for which sites I have a tab open, and I can literally see in the dev tools they have cookies and other storage. Maybe not all of them cache, but most do, and all those sites definitely have other storage like localStorage, and cookies.

How can I get the mentioned feature to *actually* show all sites that have any kind of data that I might wish to clear?

And if I find 2 or 3 sites are missing from there, how many more are missing that I'm just not noticing?...

Hi! I'm trying to set Thunderbird as the operating system default under Win 11. I tried to follow Mozilla's instructions: 1. Open the Settings application by pressing and releasing the Windows Start button, then clicking the gear icon. 2. Click the Apps icon, then click Default Apps in the list. 3. Click the icon under the heading Email to show your choices. 4. Select Thunderbird. The trouble is that at n. 3 there is no choice. There is only 'OutlookAccounts' and this item cannot be deleted or replaced. Can you help? All the best, Robifiori