I just noticed that the Homepage is overlaid by the Google Search window also whenever I scroll up/down or down/up.

You can try the following to solve the problem: 1)Check your homepage settings. Go to Firefox's preferences and ensure that your homepage is set correctly.

2)Check your extensions. Sometimes, extensions can cause issues with the browser. Go to Firefox's Add-ons Manager and check if you have any extension that might be causing the issue and remove or disable it.

3)Check if there's a problem with your browser cache. Clear your browser cache and cookies by going to Firefox's preferences and then "Privacy & Security" and then Clear Data.

4)Check if the issue is caused by a problem with the browser's JavaScript settings. Go to Firefox's preferences and then "Content" and then uncheck the box for "Enable JavaScript" and then close and reopen Firefox and check if the issue still persists.

5)If none of the above steps work, try resetting Firefox to its default settings. This can be done by going to the "Help" menu and selecting "Troubleshoot Information", then clicking on the "Reset Firefox" button. This will reset Firefox to its default settings and remove any customizations or add-ons you have installed.

I did option 5. re-set Firefox to its default settings but it does not work. It also created a file called "old Firefox data" which I assume hold my settings before I re-set Firefox, and which I guess I should delete. I tried some other default screens and noticed that it seems to occur only on my internet provider's screen, maybe it's their issue as it seems to occur only on their screens which have the "Google search window". I will contact them. Thanks.