Diễn đàn hỗ trợ Firefox

For a long time this scenario has worked fine.... I have multiple tabs open, we'll just say A & B. In Tab A I click something I know will generate a pop up on this page in a while, but I manually swap to Tab B to start working on something else. When the pop up appears in Tab A, I can see the text of the tab go bold, and my view remains on Tab B so I can continue as I want.

But now suddenly, when I switch to Tab B, once that pop up appears in Tab A my view is forcibly changed to Tab A instantly. Pretty inconvenient since it interrupts what I'm doing in Tab B.

How can I go back to the original behavior?

Recently having problems with very slow running and freezing so performed a refresh. Now I seem to have lost all my tabs that automatically opened when starting Firefox. Can I get them back from the Old Firefox Data folder that the Refresh process created on my Desktop or do I have to start again and remember all 78 tabs that used to be on my Home Page?