Earlier quoted context omitted.
Did you try filing a bug report?
If I had filed a bug report I would have then had to gather logs and other such things to get the developers whatever information they need to fix it, and frankly I just don't care about helping them fix it enough to bother with that. I didn't choose it for these devices it was just the default. For my purposes it was just much easier to switch to a browser that wouldn't hang the system if it was left open for a few…
"All my Lubuntu devices" makes it sound like you have a lot of devices, thus increasing the likelihood of being easy to reproduce. There might even already exist a bug report which you could contribute to.