(Tedious disclaimer: my opinions only, not representing anybody else or my employer. I work at Google, not on hangouts) These problems are largely resolved by

(Tedious disclaimer: my opinions only, not representing anybody else or my employer. I work at Google, not on hangouts) These problems are largely resolved by using chrome. Pop out any tab into its own window, notifications will work reliably, the security model is far stronger, and most important of all: when one tab crashes, it's an independent process so it can't take any other tab with it. I use this every day without seeing any of these issues.