Mozilla's Web extension API does not allow for the feature you would like and we have never advertised that the extension offers the possibility to import your search engines from Firefox. Unfortunately, this has to be done manually in the extension's preferences page. Please be fair and reconsider your rating.
This one now deletes my custom search engines whenever I open the browser, but it used to work perfectly. Hopefully, there will be a fix for this soon. I appreciate all the hard work done by the developers to make a great add-on.
Hi Olivier. Thanks very much for this extension and your time spent developing it. It replaces a now deprecated extension and is very valuable to me. I am having an issue with 3.72 that others have reported. Namely, when I delete a search engine the list of search engines disappears. A refresh brings it back, but this adds a lot of time to the removal process.