Bugzilla

**Affected versions**
* 85.0b7, 86.0a1(2020-01-06)

**Affected platforms**
* macOS 11.0, Windows 10;

**Steps to reproduce**
1. Launch Firefox, access https://accounts.firefox.com
2. Perform an invalid action so the [Error 500] message is displayed;
3. Click on the triangle to expand for details;

**Expected result**
* message is contained in the section;

**Actual result**
* error message passes through;

**Regression range**
* not a browser regression, page issue;

**Additional notes**
* attached screenshot to illustrate issue.

**Affected versions**
* 85.0b7, 86.0a1(2020-01-06)

**Affected platforms**
* macOS 11.0, Windows 10;

**Steps to reproduce**
1. Launch Firefox, access https://accounts.firefox.com
2. Perform an invalid action so the [Error 500] message is displayed;
3. Click on the triangle to expand for details;

**Expected result**
* message is contained in the section;

**Actual result**
* error message passes through;

**Regression range**
* not a browser regression, page issue;

**Additional notes**
* might need to be moved to another section as it is not a direct browser issue, just the string container that might need an update.
* attached screenshot to illustrate issue.