Firefox Window Tab not loading

Given the latest issues with the Chrome extension issues with Manifest V3 I installed Firefox (both on my Imac and Chomebook. I have the monitors setup to open in a window as my monitors need an active tab to run. However, when I run the monitors the window opens but it’s blank , nothing loads (there is no link in the browser address tab). If I just go on monitors page in Firefox and click one of the monitors the page opens easily in a separate tab. Anyone has this issue and hopefully a solution where the monitors opened in separate window do not open the actual page it needs to monitor?

There is an issue with pages loading in a window in Firefox. We are investigating this and will update the add-on, but the update and review process may take some time. In the meantime, we recommend using the desktop app when a page requires an active window for checks.