Look for extensions in $CHROMIUM_EXTENSION_DIRECTORY instead of
/usr/share/chromium/extensions.

--- a/chrome/common/chrome_paths.cc
+++ b/chrome/common/chrome_paths.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/common/chrome_paths.h"
 
+#include "base/environment.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/native_library.h"
@@ -511,7 +512,13 @@
 #endif
 #if defined(OS_LINUX) || defined(OS_CHROMEOS)
     case chrome::DIR_STANDALONE_EXTERNAL_EXTENSIONS: {
-      cur = base::FilePath(kFilepathSinglePrefExtensions);
+      std::unique_ptr<base::Environment> environment(base::Environment::Create());
+      std::string extension_dir;
+      if (environment->GetVar("CHROMIUM_EXTENSION_DIRECTORY", &extension_dir)) {
+        cur = base::FilePath(extension_dir);
+      } else {
+        cur = base::FilePath(kFilepathSinglePrefExtensions);
+      }
       break;
     }
 #endif
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<div class='path'>path: <a href='/guix/log/?id=f6943167b4a1c5b0fd2de9ed1eaa13461bd31fe1'>root</a>/<a href='/guix/log/gnu?id=f6943167b4a1c5b0fd2de9ed1eaa13461bd31fe1'>gnu</a>/<a href='/guix/log/gnu/services.scm?id=f6943167b4a1c5b0fd2de9ed1eaa13461bd31fe1'>services.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services.scm?id=f6943167b4a1c5b0fd2de9ed1eaa13461bd31fe1&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-08-30 00:40:04 +0200'>2022-08-30</span></td><td><a href='/guix/commit/gnu/services.scm?id=9096bc28a30d48486efa13488ac4814b2ccd0fa2'>services: provenance: Use 'current-channels' to obtain provenance data.</a><span class='msg-avail'>...<span class='msg-tooltip'>Previously, build-time metadata from (guix config) would be ignored when
available--e.g., when running /run/current-system/profile/bin/guix.

This is a followup to 316fc2acbb112bfa572ae30f95a93bcd56621234.

* gnu/services.scm (provenance-entry): Use 'current-channels' instead of
'current-profile' + 'profile-channels'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-05-29 02:00:19 +0200'>2022-05-29</span></td><td><a href='/guix/commit/gnu/services.scm?id=4cb6994790d1b499bc07f183ac9d7b4fbfc3c9bc'>gnu: services: Update setuid service description.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services.scm (setuid-program-service-type)[description]:
Remove ‘root’, add ‘setgid’.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2022-05-18 22:29:54 +0200'>2022-05-18</span></td><td><a href='/guix/commit/gnu/services.scm?id=3948ac25b1dccc40c7fdf56377f94a0775a835ee'>services: Make &lt;service-type&gt; 'description' field mandatory.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services.scm (&lt;service-type&gt;)[description]: Remove default value.
* tests/services.scm: Add 'description' field to each 'service-type' form.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-05-18 22:29:54 +0200'>2022-05-18</span></td><td><a href='/guix/commit/gnu/services.scm?id=9a5d68692314bebd16dbcdc0d4e4e52fa4d5812f'>services: Add more description fields.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services.scm (simple-service): Add 'description' field.
* gnu/services/base.scm (udev-rules-service): Likewise.
* gnu/system/install.scm (configuration-template-service-type): Likewise.
* gnu/tests.scm (marionette-service-type): Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-03-10 23:46:51 +0100'>2022-03-10</span></td><td><a href='/guix/commit/gnu/services.scm?id=1b8f6a4cadf1715d3e4dc03dde06956fa3defdb6'>services: startup: Add description.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services.scm (hurd-startup-service-type)[description]: New field.
</span></span></td><td>Ludovic Courtès</td></tr>