Diễn đàn hỗ trợ Firefox

I updated yesterday to Windows 11. Following that update,I had a few difficulties getting Firefox up & running. It seems to be OK now except for the Firefox icon appearing twice on my taskbar when I switch on my computer. Is there an easy solution? I am not technically skilled. Thanks for any guidance.

Every website I try to visit with Firefox produces a page which reads "Suspected Phishing." And when I click on "Ignore and proceed" I am taken to a blank webpage. Each web address in the URL field reads "SmartDirect.de." Firefox has thus, for me, become a useless browser.

Is there anything I can do to fix this problem with Firefox? In answering my question please bear in mind I do not have a PhD from MIT and am not an expert in computer science.

I have Firefox version 136.0.2. I think it was quite recently updated. The right click menu is broken. The choice list is much longer, and the choices "open link in new tab" and "copy link" (ones I tried) do not work. This only started happening this morning. Right click works fine in Chrome. Screenshot included.