Affected versions

• 66.0.2, 67.0b8, 68.0a1 (2019-04-05)

Affected platforms

• Windows 10, macOS 10.14, Ubuntu 16.04;

Steps to reproduce

1. Launch Firefox, enable the devTools inspector with the Rules section and Changes tab being displayed;
2. Make any change in the rules inspector;
3. Toggle the devTools off;
4. Toggle the devTools on.

Expected result

• The changes are still displayed in the Changes tab;

Actual result

• The Changes tab is in the default-empty state;
• Changes performed in the Rules section are still in effect;

Regression range

• not a regression;

Additional notes

• attached recording with the issue;

This was a potential feature for Track Changes M1, but it got de-prioritized in favor of other features.
It's on the backlog in the PRD. I'll mark it as a P3 so it's officially on the backlog here in Bugzilla as well.

This may or may not be handled in the same solution as for persisting changes across page refresh in Bug 1468783