How to fix Firefox’s “An accessibility tool is or was active” e10s error

The problem is an obscure about:config setting.

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So you want to try Mozilla Firefox’s new (Nightly build) multiprocess – e10s – functionality, but the option is greyed out with the following ominous message:

“An accessibility tool is or was active”

Here’s what to do:

  1. Navigate to about:config.
  2. In the search bar, enter browser.tabs.remote.autostart.disabled-because-using-a11y.
  3. In the results, toggle the corresponding entry value to false.

e10s should run just fine now.

Author: jdrch

ISTJ, Rice Owl, UF Gator, mechanical engineer. STEM, sports, music, movies, humor. Account mine only & unaffiliated.

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