Hi, thanks for replying.
Windows version 2004 OS Build 19041.685 The browser was Firefox and the tab was one of several that opened in Firefox after using Ccleaner. When I tried to reload the first tab I noticed the missing menu items on the right click menu. That was the first actiobn after running CCleaner.
I'm not using any antivirus software except Windows Defender.
When I right click in this message I can only see 3 menu items: Check spelling, Languages and Translate. When I highlight some text and right click there are a couple of additional choices, Screenshot, Search Google (for whatever text is highlighted).