Massive Virtual Memory over-allocation

[dom-de-v]

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Description

When adding/using release (8.4.2) extension from the Firefox extension site, to Firefox 70.0.1 (64bit) for MacOS, on MacOS 10.11.6 - the Virtual memory used by this extension (within the firefox plugin process) goes from 6gb to 12gb or even as high as 36Gb.

Before uninstall/re-install it was jumping to 36Gb of memory - even on a system disconnected from the internet on startup.

It seems like this extension is allocating a massive data structure, and then never using it - however this distresses systems at startup (given the VM still needs to be allocated & cleared).

Upon use resident memory is a few hundred megs, but virtual remains 2x-4x the expected size, and the browser/system is consequently very laggy.

[Description of the bug or feature]

Expected Behavior

Disabling returns virtual memory use for the plugin process back to 6Gb, from 36/12 Gb.

[What you expected to happen]

Actual Behavior

Massive allocation of virtual memory, and browser/system slowdown which allocation occurs & while browsing.

[What actually happened]

Steps to Reproduce

1. [First Step]
2. [Second Step]
3. [and so on...]

Versions

• Browser: Firefox 70.0.1 (64 bit) (standard release)
• OS: MacOS 10.11.6
• Node: n/a
• NPM: n/a

[christophertino]

Is this from the FirefoxCP WebExtensions process? I'm showing 13GB of virtual memory on my system as well. That seems excessive.