Rename config field for browsers
diff --git a/emsdk_manifest.json b/emsdk_manifest.json
index 8f499d9..6aecd85 100644
--- a/emsdk_manifest.json
+++ b/emsdk_manifest.json
@@ -346,9 +346,9 @@
     "version": "65.0",
     "bitness": 64,
     "url": "downloaded via mozdownload script, but a dummy directive is placed here so emsdk understands this Tool to be downloaded from the web",
-    "activated_cfg": "EMTEST_BROWSER=%installation_dir%/firefox%.exe%",
+    "activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%installation_dir%/firefox%.exe%",
     "activated_env": "EMTEST_BROWSER=%installation_dir%/firefox%.exe%",
-    "mac_activated_cfg": "EMTEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
+    "mac_activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
     "mac_activated_env": "EMTEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
     "custom_install_script": "download_firefox"
   },
@@ -357,9 +357,9 @@
     "version": "68.12.0esr",
     "bitness": 64,
     "url": "downloaded via mozdownload script, but a dummy directive is placed here so emsdk understands this Tool to be downloaded from the web",
-    "activated_cfg": "EMTEST_BROWSER=%installation_dir%/firefox%.exe%",
+    "activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%installation_dir%/firefox%.exe%",
     "activated_env": "EMTEST_BROWSER=%installation_dir%/firefox%.exe%",
-    "mac_activated_cfg": "EMTEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
+    "mac_activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
     "mac_activated_env": "EMTEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
     "custom_install_script": "download_firefox"
   },
@@ -368,9 +368,9 @@
     "version": "78.15.0esr",
     "bitness": 64,
     "url": "downloaded via mozdownload script, but a dummy directive is placed here so emsdk understands this Tool to be downloaded from the web",
-    "activated_cfg": "EMTEST_BROWSER=%installation_dir%/firefox%.exe%",
+    "activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%installation_dir%/firefox%.exe%",
     "activated_env": "EMTEST_BROWSER=%installation_dir%/firefox%.exe%",
-    "mac_activated_cfg": "EMTEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
+    "mac_activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
     "mac_activated_env": "EMTEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
     "custom_install_script": "download_firefox"
   },
@@ -379,9 +379,9 @@
     "version": "91.13.0esr",
     "bitness": 64,
     "url": "downloaded via mozdownload script, but a dummy directive is placed here so emsdk understands this Tool to be downloaded from the web",
-    "activated_cfg": "EMTEST_BROWSER=%installation_dir%/firefox%.exe%",
+    "activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%installation_dir%/firefox%.exe%",
     "activated_env": "EMTEST_BROWSER=%installation_dir%/firefox%.exe%",
-    "mac_activated_cfg": "EMTEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
+    "mac_activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
     "mac_activated_env": "EMTEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
     "custom_install_script": "download_firefox"
   },
@@ -390,9 +390,9 @@
     "version": "102.15.1esr",
     "bitness": 64,
     "url": "downloaded via mozdownload script, but a dummy directive is placed here so emsdk understands this Tool to be downloaded from the web",
-    "activated_cfg": "EMTEST_BROWSER=%installation_dir%/firefox%.exe%",
+    "activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%installation_dir%/firefox%.exe%",
     "activated_env": "EMTEST_BROWSER=%installation_dir%/firefox%.exe%",
-    "mac_activated_cfg": "EMTEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
+    "mac_activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
     "mac_activated_env": "EMTEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
     "custom_install_script": "download_firefox"
   },
@@ -401,9 +401,9 @@
     "version": "115.28.0esr",
     "bitness": 64,
     "url": "downloaded via mozdownload script, but a dummy directive is placed here so emsdk understands this Tool to be downloaded from the web",
-    "activated_cfg": "EMTEST_BROWSER=%installation_dir%/firefox%.exe%",
+    "activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%installation_dir%/firefox%.exe%",
     "activated_env": "EMTEST_BROWSER=%installation_dir%/firefox%.exe%",
-    "mac_activated_cfg": "EMTEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
+    "mac_activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
     "mac_activated_env": "EMTEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
     "custom_install_script": "download_firefox"
   },
@@ -412,9 +412,9 @@
     "version": "128.14.0esr",
     "bitness": 64,
     "url": "downloaded via mozdownload script, but a dummy directive is placed here so emsdk understands this Tool to be downloaded from the web",
-    "activated_cfg": "EMTEST_BROWSER=%installation_dir%/firefox%.exe%",
+    "activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%installation_dir%/firefox%.exe%",
     "activated_env": "EMTEST_BROWSER=%installation_dir%/firefox%.exe%",
-    "mac_activated_cfg": "EMTEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
+    "mac_activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
     "mac_activated_env": "EMTEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
     "custom_install_script": "download_firefox"
   },
@@ -423,9 +423,9 @@
     "version": "140.3.1esr",
     "bitness": 64,
     "url": "downloaded via mozdownload script, but a dummy directive is placed here so emsdk understands this Tool to be downloaded from the web",
-    "activated_cfg": "EMTEST_BROWSER=%installation_dir%/firefox%.exe%",
+    "activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%installation_dir%/firefox%.exe%",
     "activated_env": "EMTEST_BROWSER=%installation_dir%/firefox%.exe%",
-    "mac_activated_cfg": "EMTEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
+    "mac_activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
     "mac_activated_env": "EMTEST_BROWSER=%installation_dir%/Contents/MacOS/firefox%.exe%",
     "custom_install_script": "download_firefox"
   },
@@ -435,9 +435,9 @@
     "bitness": 64,
     "url": "downloaded via mozdownload script, but a dummy directive is placed here so emsdk understands this Tool to be downloaded from the web",
     "git_branch": "dummy field, to instruct emsdk to attempt to reinstall this tool even if it is installed, to check for new version",
-    "activated_cfg": "EMTEST_BROWSER=%actual_installation_dir%/firefox%.exe%",
+    "activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%actual_installation_dir%/firefox%.exe%",
     "activated_env": "EMTEST_BROWSER=%actual_installation_dir%/firefox%.exe%",
-    "mac_activated_cfg": "EMTEST_BROWSER=%actual_installation_dir%/Contents/MacOS/firefox%.exe%",
+    "mac_activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%actual_installation_dir%/Contents/MacOS/firefox%.exe%",
     "mac_activated_env": "EMTEST_BROWSER=%actual_installation_dir%/Contents/MacOS/firefox%.exe%",
     "custom_install_script": "download_firefox",
     "custom_is_installed_script": "is_firefox_installed"
@@ -448,9 +448,9 @@
     "bitness": 64,
     "url": "downloaded via mozdownload script, but a dummy directive is placed here so emsdk understands this Tool to be downloaded from the web",
     "git_branch": "dummy field, to instruct emsdk to attempt to reinstall this tool even if it is installed, to check for new version",
-    "activated_cfg": "EMTEST_BROWSER=%actual_installation_dir%/firefox%.exe%",
+    "activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%actual_installation_dir%/firefox%.exe%",
     "activated_env": "EMTEST_BROWSER=%actual_installation_dir%/firefox%.exe%",
-    "mac_activated_cfg": "EMTEST_BROWSER=%actual_installation_dir%/Contents/MacOS/firefox%.exe%",
+    "mac_activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%actual_installation_dir%/Contents/MacOS/firefox%.exe%",
     "mac_activated_env": "EMTEST_BROWSER=%actual_installation_dir%/Contents/MacOS/firefox%.exe%",
     "custom_install_script": "download_firefox",
     "custom_is_installed_script": "is_firefox_installed"
@@ -461,9 +461,9 @@
     "bitness": 64,
     "url": "downloaded via mozdownload script, but a dummy directive is placed here so emsdk understands this Tool to be downloaded from the web",
     "git_branch": "dummy field, to instruct emsdk to attempt to reinstall this tool even if it is installed, to check for new version",
-    "activated_cfg": "EMTEST_BROWSER=%actual_installation_dir%/firefox%.exe%",
+    "activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%actual_installation_dir%/firefox%.exe%",
     "activated_env": "EMTEST_BROWSER=%actual_installation_dir%/firefox%.exe%",
-    "mac_activated_cfg": "EMTEST_BROWSER=%actual_installation_dir%/Contents/MacOS/firefox%.exe%",
+    "mac_activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%actual_installation_dir%/Contents/MacOS/firefox%.exe%",
     "mac_activated_env": "EMTEST_BROWSER=%actual_installation_dir%/Contents/MacOS/firefox%.exe%",
     "custom_install_script": "download_firefox",
     "custom_is_installed_script": "is_firefox_installed"
@@ -474,9 +474,9 @@
     "bitness": 64,
     "url": "downloaded via mozdownload script, but a dummy directive is placed here so emsdk understands this Tool to be downloaded from the web",
     "git_branch": "dummy field, to instruct emsdk to attempt to reinstall this tool even if it is installed, to check for new version",
-    "activated_cfg": "EMTEST_BROWSER=%actual_installation_dir%/firefox%.exe%",
+    "activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%actual_installation_dir%/firefox%.exe%",
     "activated_env": "EMTEST_BROWSER=%actual_installation_dir%/firefox%.exe%",
-    "mac_activated_cfg": "EMTEST_BROWSER=%actual_installation_dir%/Contents/MacOS/firefox%.exe%",
+    "mac_activated_cfg": "EMSDK_ACTIVATED_TEST_BROWSER=%actual_installation_dir%/Contents/MacOS/firefox%.exe%",
     "mac_activated_env": "EMTEST_BROWSER=%actual_installation_dir%/Contents/MacOS/firefox%.exe%",
     "custom_install_script": "download_firefox",
     "custom_is_installed_script": "is_firefox_installed"