That's strange. Firefox would usually only check your system's other browsers when you first install it, or perhaps when you create a new profile.

Have you set up Sync? If so, could they be bookmarks from another installation of Firefox connected to the same Firefox account?

Thank you for sharing your add-ons list. What does "iCloud Bookmarks" do? Could that have some role in this problem?

no Sync installed

good question dont have a clue what iCloud Bookmarks do maybe I sould remove it

ok just read Keep your Firefox bookmarks on Windows up to date with the Safari bookmarks on your iPhone, iPad, and Mac.Keep your Firefox bookmarks on Windows up to date with your Safari bookmarks on iPhone, iPad, and Mac with the iCloud Bookmarks extension for Firefox.

iCloud stores your website bookmarks, so they are everywhere you go — on your iPhone, iPad, iPod touch, Mac, and PC. So when it comes to your devices, you can switch things up without mixing things up.

Note: iCloud Bookmarks extension for Firefox is for Windows 7 or later.

Maybe Apple snuck that in there with iTunes.

You can view, disable, and often remove unwanted or unknown extensions on the Add-ons page. Either:

• Ctrl+Shift+a (Mac: Command+Shift+a)
• "3-bar" menu button (or Tools menu) > Add-ons
• type or paste about:addons in the address bar and press Enter/Return

In the left column of the Add-ons page, click Extensions.

Then cast a critical eye over the list on the right side. Any extensions Firefox installs for built-in features are hidden from this page, so everything listed here is your choice (and your responsibility) to manage.

Any improvement if you disable or remove iCloud Bookmarks?

i removed it and so far no extra bookmarks... we will see I agree it snuck in with itunes