Changes made to To, Subject and Message content fields of Draft are not saved if Draft contains hyperlink that was pressed from Preview mode (Firefox only).

Preconditions:

1. You should have a User on Forum with at least one Draft message saved in Messages

Steps to reproduce:

1. Login to forum as User
2. Go to User Menu ->Messages and press "Drafts" button.
3. Click on Subject link of any Draft in the folder
4. Edit data in "To" and "Subject" fields to any other valid data.
5. Type some text that contains hyperlink in Message content field.
6. Press "Preview" button
7. Click on hyperlink from the Preview mode
8. Click on "Back" button on the browser's navigation toolbar
9. Overview To, Subject and Message content fields of the PM

Actual results:
To, Subject and Message content fields contains data that was present before they were edited.
Expected results:
To, Subject and Message content fields should contain data that was present before Preview button was pressed.

Reproduced for Firefox only