2.3.3

• Just update strict_max_version

2.3.2

• Fix header display on TB 100.0+

2.3.1

• Avoid error when there is no Received header

2.3.0

• Add option to filter headers by order numbers

2.2.0

• Add support for multiple capturing groups

Updating
Starting from version 2.2.0 the add-on displays header parts that matches all capturing groups of the regular expression. Previously it displayed only the first capturing group match.
Users may need to update regular expressions replacing 2nd+ capturing groups with non-capturing groups (:?…).

2.1.1

• Hide header until its value is set

2.1.0

• Add support for messages displayed in a window

2.0.1

• Hide header if no matches found

2.0.0

The add-on has been rewritten as MailExtension.

• This breaks compatibility with previous Thunderbird versions.
• The add-on requires full unrestricted access to Thunderbird for being able to display the Received header in the message header area.

Migration
You need to re-enter the add-on configuration settings. It is merely a single option: the regular expression.
In case you forgot it, look for extensions.received.regexp preference in the Configuration Editor (about:config page).

1.0.0

• Convert to Thunderbird 68 compatible add-on. This breaks compatibility with previous Thunderbird versions.