diff --git a/browser-targets.json b/browser-targets.json
new file mode 100644
index 00000000..32b5df5a
--- /dev/null
+++ b/browser-targets.json
@@ -0,0 +1,13 @@
+{
+    "firefox": {
+        "minimumVersion": "91.1.0",
+        "manifestVersionPath": [
+            "applications",
+            "gecko",
+            "strict_min_version"
+        ]
+    },
+    "chrome": {
+        "minimumVersion": "114"
+    }
+}
diff --git a/scripts/build.sh b/scripts/build.sh
index 7f43e24c..3d7b6d4c 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -85,7 +85,7 @@ rmdir buildtemp
 
 # Copy extra static files across
 
-cp src/manifest.json build/
+node scripts/generate_manifest.js firefox src/manifest.json build/manifest.json
 cp -r src/static build
 cp -r generated/static build
 cp issue_template.md build/
diff --git a/scripts/generate_manifest.js b/scripts/generate_manifest.js
new file mode 100644
index 00000000..31b422b6
--- /dev/null
+++ b/scripts/generate_manifest.js
@@ -0,0 +1,30 @@
+#!/usr/bin/env node
+
+const fs = require("fs")
+const targets = require("../browser-targets.json")
+
+function generateManifest(template, targetName) {
+    const target = targets[targetName]
+    if (!target || !target.manifestVersionPath) {
+        throw new Error(`No manifest settings for ${targetName}`)
+    }
+
+    const manifest = JSON.parse(JSON.stringify(template))
+    const path = target.manifestVersionPath.slice()
+    const property = path.pop()
+    const parent = path.reduce((value, name) => {
+        if (!value[name]) value[name] = {}
+        return value[name]
+    }, manifest)
+    parent[property] = target.minimumVersion
+    return manifest
+}
+
+if (require.main === module) {
+    const [targetName, source, destination] = process.argv.slice(2)
+    const template = JSON.parse(fs.readFileSync(source, "utf8"))
+    const manifest = generateManifest(template, targetName)
+    fs.writeFileSync(destination, JSON.stringify(manifest, null, 4) + "\n")
+}
+
+module.exports = generateManifest
diff --git a/src/manifest.json b/src/manifest.json
index c1089c0f..9b0136d9 100644
--- a/src/manifest.json
+++ b/src/manifest.json
@@ -139,8 +139,7 @@
     ],
     "applications": {
         "gecko": {
-            "id": "tridactyl.vim.betas@cmcaine.co.uk",
-            "strict_min_version": "91.1.0"
+            "id": "tridactyl.vim.betas@cmcaine.co.uk"
         }
     },
     "options_ui": {
@@ -161,4 +160,4 @@
     "omnibox": {
         "keyword": "tri"
     }
-}
\ No newline at end of file
+}