Implement basic compatibility with SeaMonkey, see #14

content/addon.js

@@ -92,6 +92,8 @@ let Addon = {
 		let appver;
 		if (Services.appinfo.name == "Pale Moon") {
 			appver = "27.9";
+		} else if (Services.appinfo.name == "SeaMonkey") {
+			appver = "52.0";
 		} else {
 			appver = Services.appinfo.version;
 		}

content/list.js

@@ -172,6 +172,8 @@ let List = {
 			let appver;
 			if (Services.appinfo.name == "Pale Moon") {
 				appver = "27.9";
+			} else if (Services.appinfo.name == "SeaMonkey") {
+				appver = "52.0";
 			} else {
 				appver = Services.appinfo.version;
 			}

content/versions.js

@@ -110,6 +110,8 @@ let Versions = {
 			let appver;
 			if (Services.appinfo.name == "Pale Moon") {
 				appver = "27.9";
+			} else if (Services.appinfo.name == "SeaMonkey") {
+				appver = "52.0";
 			} else {
 				appver = Services.appinfo.version;
 			}