received

New Features:

• Added "Substitute folding white spaces (FWS)" option for Thunderbird 128 Beta and later. Enabled by default to ensure compatibility with existing user configurations.

Behavior changes:

• In Thunderbird 128 Beta, headers unfolding behavior has been updated to retain folding white spaces (FWS) instead of substituting them with spaces as in previous Thunderbird versions.

• Remove unused load detection

• Add support for TB 111+

• Add negative header indices support. Negative indices count backwards from the bottom of the message.
• Improve single line mode headers separator. Now the arrow points in mail flow direction and the box is used as a separator for out-of-order sequences. The arrow has been replaced with a heavy arrow, so it is easier to spot in a long string of text.

• Fix multiple headers display on TB102+

• Restore copy popup on TB100+

• Hide Received header until its value is set
  to avoid showing header of the previous message during network/processing delay

• Add option to remove duplicate headers. Submitted by: @the-glu
• Add option to display all headers on a single line. Submitted by: @the-glu

• Just update strict_max_version

• Fix header display on TB 100.0+

• Avoid error when there is no Received header

• Add option to filter headers by order numbers

• 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 (:?…).

• Hide header until its value is set

• Add support for messages displayed in a window

• Hide header if no matches found

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).

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

• Rework inline options to preferences window since inline options are not supported anymore in Thunderbird 58+

• [CritFix] Do not download attachments if the message is stored only on the remote IMAP server