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About this Add-on
SMS support limited to carriers noted at textbelt.com.
Unfortunately, this service doesn't offer option to supply a reply number or address for recipient to reply to. But you can put that inside the SMS message if needed.
I built this extension since the service provider is only an API (for developers). Well, here's an extension for the everyday folks to use it, no scripting/programming needed.
Source code for the extension will be available at https://github.com/daluu/textbelt-clients
You can try to get support at the Github site link above. Bear in mind some of your support issues may be specific to the Textbelt API rather than the extension, so then I may not be able to help you in that case, contact the API developer at textbelt.com instead.
If this extension isn't a fit for you, alternatively you can try the AutoSMS Firefox addon.