I have been using Yahoo with Firefox for years (at least 10), and this sort of problem has only arisen since Firefox V100. I often get 'No internet connection' (this is a lie: everything is connected) and the only way to solve it (temporarily) is to close the Yahoo tab. Sometimes Yahoo will not then reload and I have to close Firefox and reopen it. Always when this happens, Firefox reports that it has not been closed and I have to click on the close option in the box which has popped up. This does not happen if I close Firefox and reopen it when Yahoo is not playing up. It is disconcerting to have to close Firefox when I have other things going on which require immediate attention. I used to refresh Firefox very frequently but this seems no more a solution to 'No internet connection' than just restarting the tab/Firefox. I like Firefox far better than Chrome but this is a nuisance which has been nagging on for some time. Obviously an incompatibility which seems to have been introduced with V100 and not resolved. It may not be Firefox' responsibility to make Yahoo work, but couldn't you work with them to find out what's causing this?

I think Firefox is a dumpster fire with the last update. I get the constant "No Internet Connection" in Yahoo email but the bigger issue is Yahoo email crashes and the window closes every single time I download a photo and since I'm a graphic designer doing ad work that is almost daily some months. This does not happen in Safari or Chrome. It's a time waster and I'm ready to dump Firefox altogether. This seems like it should be a simple fix if the other browsers got it right.