This might be the right place to look into: https://hg.mozilla.org/mozilla-central/file/default/toolkit/components/reader https://hg.mozilla.org/mozilla-centra

This might be the right place to look into: https://hg.mozilla.org/mozilla-central/file/default/toolkit/components/reader https://hg.mozilla.org/mozilla-central/file/default/toolkit/... Especially: https://hg.mozilla.org/mozilla-central/file/a6a5a4f31ea26906e584e162b8d9485e6cacca32/toolkit/components/reader/Readability-readerable.js#l51 https://hg.mozilla.org/mozilla-central/file/a6a5a4f31ea26906... Edit: this is a potshot.