Rated 4 out of 5 stars

Pros:
- It works
- Has import options

Cons:
- Doesn't accept HTML signatures
- Doesn't link to the account signatures that have already been created.

Rated 3 out of 5 stars

テキストメールでも署名が挿入できると嬉しいです。

Rated 4 out of 5 stars

I too was looking for a replacement for Signature Switch (it hasn't been updated since 2019 and won't work with new versions of Thunderbird). I found this addon to be useful but it requires manually adding a signature to each email so, while it lets you choose between several sig files, it isn't as handy as SigSwitch. If the author can make it automatically insert the sig then it will get 5 stars. But it does work. You just have to look for the Kanji character that is at the right end of the font choices to access your sigs.

Rated 1 out of 5 stars

I was looking for a replacement for Signature Switch - this isn't it. It has NO instructions, appears to have no configuration and does nothing.

I'm sorry and you are right. This is a text inserter, and this doesn't equip the feature of Signature Switch you are looking for.

Rated 4 out of 5 stars

This is really useful. Works simply but would be even more helpful if basic styling (bold, italic, underline) could be added.

Rated 5 out of 5 stars

Super, Übernahme der Signaturen aus Windows Live Mail gelingt sehr einfach

Rated 5 out of 5 stars

Like it, quick and intuitive.

Hoping for further enhancements (maybe the japanese symbol can be changed to access the add-on, an Icon would be great, as my japanese is not very good. Also formatted text of course would be great. Also inserting signatures via keyboard shortcuts ...)