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=b587d0bf368e7b19370210e5a9e25dfa4f41bd00'>root</a>/<a href='/guix/log/etc?id=b587d0bf368e7b19370210e5a9e25dfa4f41bd00'>etc</a>/<a href='/guix/log/etc/completion?id=b587d0bf368e7b19370210e5a9e25dfa4f41bd00'>completion</a>/<a href='/guix/log/etc/completion/zsh?id=b587d0bf368e7b19370210e5a9e25dfa4f41bd00'>zsh</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/etc/completion/zsh?id=b587d0bf368e7b19370210e5a9e25dfa4f41bd00&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-10-24 20:17:05 +0200'>2021-10-24</span></td><td><a href='/guix/commit/etc/completion/zsh?id=55f6d9e818512b4e3e4adacfa99deb201b6854be'>etc: completion: Filter gratuitous spaces from available packages.</a><span class='msg-avail'>...<span class='msg-tooltip'>Tested with:

  guix environment --{ad-hoc,pure} zsh guix bash-completion coreutils -- zsh
  % fpath=(~/guix/etc/completion/zsh $fpath)
  % autoload -U compinit; compinit

* etc/completion/zsh/_guix (_guix_list_available_packages): Remove spaces.

Co-authored-by: Tobias Geerinckx-Rice &lt;me@tobias.gr&gt;
</span></span></td><td>Liliana Marie Prikler</td></tr>
<tr><td><span title='2021-08-28 17:57:50 +0200'>2021-08-28</span></td><td><a href='/guix/commit/etc/completion/zsh?id=a8dd285d5a0670abf124a721e6ba94da045b24ba'>zsh completion: Add missing commands and arguments.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/completion/zsh/_guix (_guix_install, _guix_remove, _guix_upgrade):
  New functions.
  (_guix_build, _guix_challenge, _guix_download, _guix_environment,
  _guix_packages, _guix_gc, _guix_hash, _guix_lint, _guix_package,
  _guix_publish, _guix_pull, _guix_refresh, _guix_size, _guix_system):
  Add some of the missing arguments.
  (_guix_cmds): Add missing commands.

Co-authored-by: Brice Waegeneire &lt;brice@waegenei.re&gt;
</span></span></td><td>Noah Evans</td></tr>
<tr><td><span title='2021-02-17 10:52:28 +0100'>2021-02-17</span></td><td><a href='/guix/commit/etc/completion/zsh?id=ee2a5da80a9bda25542c00a7a35a9ddddcbd58af'>scripts: system: Remove 'vm-image' command.</a><span class='msg-avail'>...<span class='msg-tooltip'>Remove the 'vm-image' command that has been superseded by the 'image'
command.

* gnu/system/vm.scm (system-qemu-image): Remove it.
* guix/scripts/system.scm (system-derivation-for-action): Mark 'vm-image'
command as deprecated and use the image API to produce the VM image.
(perform-action, show-help): Adapt accordingly.
* tests/guix-system.sh: Ditto.
* doc/guix.texi (Invoking guix system,
Running Guix in a VM): Ditto.
* etc/completion/fish/guix.fish: Ditto.
* etc/completion/zsh/_guix: Ditto.
</span></span></td><td>Mathieu Othacehe</td></tr>