Annoying development in browsers and Thunderbird

Running latest Slack64-current and latest Plasma5. After the updates today, 3.3.2020 a very annoying problem has surfaced. In Chromium (Eric's latest), FF-73.0.1 or Thunderbird when I click on a link, bookmark, etc. more often than not a popup will appear offering me a number of choices such as "Open in New Tab", Open in new window, Open in private window, etc. but the link or bookmark doesn't open. If I click again sometimes I get the same popup and sometimes the link opens. In TB when I click on a mail to open it again a popup appears instead of opening the mail and it requires two to three clicks to get the mail open and not see the popup. Anyone else seeing this behavior? Any fixes to suggest? This is really getting to be a major pain.