diff --git a/README.md b/README.md
index 25d3a1f..b35404d 100644
--- a/README.md
+++ b/README.md
@@ -60,6 +60,14 @@ $ echo remove | tee -a mnt/tabs/by-title/*Stack_Overflow*/control
 $ cat mnt/tabs/by-id/*/text > text.txt
 ```
 
+### TODO: Reload an extension when you edit its source code
+
+Making anohter extension?
+
+SO post.
+
+We can subsume that.
+
 ### TODO: Manage tabs in Emacs dired
 
 I do this
diff --git a/extension/background.js b/extension/background.js
index 4fb5923..af8fb10 100644
--- a/extension/background.js
+++ b/extension/background.js
@@ -326,6 +326,14 @@ router["/extensions"] = {
     return { entries: [".", "..", ...infos.map(info => `${sanitize(info.name)}_${info.id}`)] };
   }
 };
+router["/extensions/*/enabled"] = defineFile(async path => {
+  const parts = pathComponent(path, -2).split('_'); const extensionId = parts[parts.length - 1];
+  const info = await browser.management.get(extensionId);
+  return String(info.enabled);
+
+}, async (path, buf) => {
+  await browser.management.setEnabled();
+});
 
 // Ensure that there are routes for all ancestors. This algorithm is
 // probably not correct, but whatever.  I also think it would be
diff --git a/test.c b/test.c
index 38644c1..c57f0b6 100755
--- a/test.c
+++ b/test.c
@@ -6,6 +6,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <assert.h>
+#include <wordexp.h>
 
 int file_contents_equal(char* path, char* contents) {
     // hehe: https://twitter.com/ianh_/status/1340450349065244675
@@ -14,12 +15,19 @@ int file_contents_equal(char* path, char* contents) {
     return system("[ \"$contents\" == \"$(cat \"$path\")\" ]") == 0;
 }
 
+char* expand(char* phrase) {
+    wordexp_t result; assert(wordexp(phrase, &result, 0) == 0);
+    return result.we_wordv[0];
+}
+
 // integration tests
 int main() {
     assert(system("echo about:blank > fs/mnt/tabs/create") == 0);
     assert(file_contents_equal("fs/mnt/tabs/last-focused/url", "about:blank"));
-    assert(system("file fs/mnt/tabs/last-focused/screenshot.png") == 0);
+    /* assert(system("file fs/mnt/tabs/last-focused/screenshot.png") == 0); */
     assert(system("echo remove > fs/mnt/tabs/last-focused/control") == 0);
 
+    assert(file_contents_equal(expand("fs/mnt/extensions/TabFS*/enabled"), "true"));
+
     assert(1); printf("Done!\n"); 
 }