This is to thank Lord of the Rings for very kindly and promptly answering my question two days ago.

Unfortunately I must have messed up the method suggested to solve my problem as it did not work.

I have now been told that a text typed in Word cannot be entered as a bookmark in Firefox.

A solution that works:-

Type the text in the gmail window normally used for sending messages;

Click on Bookmarks in the toolbar;

Choose Bookmark This Page;

Enter the file name that you wish to bookmark;

Click on DONE.