bookmark batch-updater от MrOtherGuy

With this extension you can modify the bookmark urls to:

• replace http: with https: of either all bookmarks or those in some domain or
• replace domain name with another

Alternatively in RegExp mode you can:

• replace any part of bookmark urls or
• replace matching bookmark names or
• both of the above simultaneously

Heads up! Due to a Firefox bug, changing bookmark URL will cause that bookmark to lose its tags. There's currently no way around that.