Maybe Fission related. (DOMFissionEnabled=1)

Crash report: https://crash-stats.mozilla.org/report/index/2558dcf9-b556-48bf-b158-a6cf30210926

MOZ_CRASH Reason: called `Result::unwrap()` on an `Err` value: Error(Msg("mmap size"), State { next_error: None })

Top 10 frames of crashing thread:

0 xul.dll RustMozCrash mozglue/static/rust/wrappers.cpp:17
1 xul.dll mozglue_static::panic_hook mozglue/static/rust/lib.rs:91
2 xul.dll core::ops::function::Fn::call<fn ../a178d0322ce20e33eac124758e837cbd80a6f633/library/core/src/ops/function.rs:227
3 xul.dll std::panicking::rust_panic_with_hook ../a178d0322ce20e33eac124758e837cbd80a6f633//library/std/src/panicking.rs:626
4 xul.dll std::panicking::begin_panic_handler::{{closure}} ../a178d0322ce20e33eac124758e837cbd80a6f633//library/std/src/panicking.rs:519
5 xul.dll std::sys_common::backtrace::__rust_end_short_backtrace<closure-0, !> ../a178d0322ce20e33eac124758e837cbd80a6f633//library/std/src/sys_common/backtrace.rs:141
6 xul.dll std::panicking::begin_panic_handler ../a178d0322ce20e33eac124758e837cbd80a6f633//library/std/src/panicking.rs:515
7 xul.dll core::panicking::panic_fmt ../a178d0322ce20e33eac124758e837cbd80a6f633//library/core/src/panicking.rs:92
8 xul.dll core::result::unwrap_failed ../a178d0322ce20e33eac124758e837cbd80a6f633//library/core/src/result.rs:1355
9 xul.dll futures_cpupool::{{impl}}::poll<futures::future::catch_unwind::CatchUnwind<std::panic::AssertUnwindSafe<futures::future::lazy::Lazy<closure-0, enum$<core::result::Result<enum$<audioipc::messages::CallbackResp>, tuple<>>, 0, 3, Ok>>>>> third_party/rust/futures-cpupool/src/lib.rs:333

Huge volume of these crashes since we shipped 93 beta 9 2 days ago. I am marking it as a release blocker.

Many user comments in crash reports indicating that they are crashing on Epic Games pages:

• https://www.epicgames.com/store/ru/p/the-escapists
• "I am on windows 7, When i load the fornite page it crashed my tab can you fix it quick?"
• Clicked on a product in the Epic Games Store and the tab crashed (multiple times).
• https://www.epicgames.com/store/en-US/p/the-escapists crashes when clicking on "get" button

All crashes are on Windows.

Beta 8 to Beta 9 changelog:
https://hg.mozilla.org/releases/mozilla-beta/pushloghtml?fromchange=FIREFOX_93_0b8_RELEASE&tochange=FIREFOX_93_0b9_RELEASE

The Bugbug bot thinks this bug should belong to the 'Core::Audio/Video: cubeb' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

This is likely to be caused by the fix in bug 1730518, unfortunately this new crash seems to have more frequency than the one we tried to fix in bug 1730518.

Duplicate of bug 1732479.