** Changed in: firefox (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1870827

Title:
  Firefox hangs after simultaneously opening Chrome/Electron-based
  applications

Status in Mozilla Firefox:
  Fix Released
Status in firefox package in Ubuntu:
  Incomplete

Bug description:
  When opening Chrome/Electron-based applications while Firefox is open, 
Firefox' tab contents stop responding, and it becomes necessary to close 
Firefox and reopen it.
  This includes:
  - VSCode: https://code.visualstudio.com/download
  - Atom: https://atom.io
  - Chromium browser

  Here's a link to a screenshot that shows Firefox with a "loading"
  waiting icon on the center of the tab (applies to any other open tab)

  https://imgur.com/PHHr3zt.png

  This has been happening since Ubuntu 14.04, but my previous report was 
quickly dismissed.
  I've done fresh installs for 14.04, 16.04 and 18.04, and the problem persists 
ever since.

  OS: Ubuntu
  Release: 18.04 LTS (other 18.04-based distros such as elementaryOS exhibit 
the same behavior)

  Firefox: 74.0.1, 64-bit (although the problem happens since 32-bit
  60.x or even earlier)

  Current Hardware: Lenovo ThinkPad T410s: Intel i5 540M processor,
  NVidia NVS3100M graphics, 8Gb RAM, 480Gb SSD

  # Expected behavior
  While Firefox is open, any Chrome/Electron-based application that is opened 
works without affecting Firefox, either loaded before or after it.

  # Observed behavior
  While Firefox is open, any Chrome/Electron-based application that is opened 
hangs Firefox, as observed according to the screenshot link provided above.

  Note that if Firefox is loaded *after* Chrome/Electron-based apps, the
  above described behavior isn't exhibited.

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