Recently I read the blog post on the new site isolation feature coming to Firefox. As I understand, two different websites will be isolated from each other and they each site will have its own operating system process. Site isolation will increase the security. https://hacks.mozilla.org/2021/05/introducing-firefox-new-site-isolation-security-architecture/
- Will this increase memory usage?
- Why is this feature not in the mobile version(android)?
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- Yes. Each process has an overhead cost. This is the main reason why previously Firefox had a process limit. For example on my system it would use up to 8 processes then start running multiple sites per-process. So if you use a lot of taps the extra memory usage can be significant. You can compare about:processes before and after to get an estimate of what it costs you.
- There is less need because the mobile version “closes” tabs much more aggressively. However it would be nice to see the string isolation guarantee in the future then though you usually get that behaviour today (based on my testing and searching).
