Make some of the changes needed to the 'makeicecat' script, to allow it to run
in a snippet without network access.  After this patch is applied, some
additional changes will be made using 'substitute*'.

diff --git a/makeicecat b/makeicecat
index bf2b7a6..bc3b19b 100755
--- a/makeicecat
+++ b/makeicecat
@@ -58,7 +58,7 @@ readonly SOURCEDIR=icecat-${FFVERSION}
 # debug/shell options
 readonly DEVEL=0
 set -euo pipefail
-(( DEVEL )) && set -x
+set -x
 
 
 ###############################################################################
@@ -459,7 +459,7 @@ configure_search()
     sed 's|ddg@|ddg-html@|' -i browser/components/search/extensions/ddg-html/manifest.json
 
     # Process various JSON pre-configuration dumps.
-    python3 ../../tools/process-json-files.py . browser/components/extensions/schemas/
+    python3 "${DATADIR}"/../tools/process-json-files.py . browser/components/extensions/schemas/
 }
 
 configure_mobile()
@@ -855,12 +855,12 @@ finalize_sourceball()
 # entry point
 ###############################################################################
 
-validate_env || exit 1
-prepare_env
-fetch_source
-verify_sources
-extract_sources
-fetch_l10n
+# validate_env || exit 1
+# prepare_env
+# fetch_source
+# verify_sources
+# extract_sources
+# fetch_l10n
 apply_patches
 configure
 configure_search
@@ -872,4 +872,4 @@ prepare_macos_packaging
 configure_extensions
 configure_onboarding
 apply_bugfixes
-finalize_sourceball
+# finalize_sourceball
</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/cpan.scm'>
<input type='hidden' name='id' value='cf0e5934d2209490b97500dcdbf2ba2196d50462'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=cf0e5934d2209490b97500dcdbf2ba2196d50462'>root</a>/<a href='/guix/log/tests?id=cf0e5934d2209490b97500dcdbf2ba2196d50462'>tests</a>/<a href='/guix/log/tests/cpan.scm?id=cf0e5934d2209490b97500dcdbf2ba2196d50462'>cpan.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/tests/cpan.scm?id=cf0e5934d2209490b97500dcdbf2ba2196d50462&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-06-09 14:19:14 +0200'>2023-06-09</span></td><td><a href='/guix/commit/tests/cpan.scm?id=f69d14d31af8325807d8529fccd3f0b6fd86e342'>tests: Ensure 'cpan' updater test does not access the network.</a><span class='msg-avail'>...<span class='msg-tooltip'>Previously it would try to access the real metacpan.org.  This would
succeed when network is available because "Test-Script" is an existing
package.

* tests/cpan.scm ("package-latest-release"): Wrap
'upstream-source-inputs' call in 'parameterize'.  Set
'current-http-proxy'.  Change the order of responses in
'with-http-server'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-05-31 23:50:06 +0200'>2023-05-31</span></td><td><a href='/guix/commit/tests/cpan.scm?id=654fcf9971bb01389d577be07c6ec0f68940c743'>tests: Use quasiquoted 'match' patterns for package sexps.</a><span class='msg-avail'>...<span class='msg-tooltip'>Turns out it's easier to read.

* tests/cpan.scm ("cpan-&gt;guix-package"): Use a quasiquoted pattern.
* tests/elpa.scm (eval-test-with-elpa): Likewise.
* tests/gem.scm ("gem-&gt;guix-package")
("gem-&gt;guix-package with a specific version")
("gem-recursive-import")
("gem-recursive-import with a specific version"): Likewise.
* tests/hexpm.scm ("hexpm-recursive-import"): Likewise.
* tests/opam.scm ("opam-&gt;guix-package"): Likewise.
* tests/pypi.scm ("pypi-&gt;guix-package, no wheel")
("pypi-&gt;guix-package, wheels")
("pypi-&gt;guix-package, no usable requirement file.")
("pypi-&gt;guix-package, package name contains \"-\" followed by digits"):
Likewise.
* tests/texlive.scm ("texlive-&gt;guix-package"): Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-05-31 23:25:25 +0200'>2023-05-31</span></td><td><a href='/guix/commit/tests/cpan.scm?id=a738c1a0c75af8b65ab5cad893e9ac2af6633d29'>import: cpan: Updater provides input list.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/import/cpan.scm (latest-release): Add 'inputs' field.
* tests/cpan.scm ("package-latest-release"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-05-31 23:25:25 +0200'>2023-05-31</span></td><td><a href='/guix/commit/tests/cpan.scm?id=c4fe4e7eb8ccbe5e8dcbcb8e64fbb3a97a498808'>import: cpan: Represent dependencies as &lt;upstream-input&gt; records.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/import/cpan.scm (cpan-name-&gt;downstream-name)
(cran-dependency-&gt;upstream-input, cran-module-inputs): New procedures.
(cpan-module-&gt;sexp)[guix-name, convert-inputs]: Remove.
[maybe-inputs]: Adjust to deal with &lt;upstream-input&gt;.
Use 'cpan-name-&gt;downstream-name' instead of 'guix-name'.  Add call to
'cpan-module-inputs' and adjust calls to 'maybe-inputs'.  No longer emit
input labels.
* tests/cpan.scm ("cpan-&gt;guix-package"): Adjust test accordingly.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-10-22 01:46:55 +0200'>2022-10-22</span></td><td><a href='/guix/commit/tests/cpan.scm?id=a3619079f95213c4f983e69210ed12b38fd31022'>Remove now unnecessary uses of (guix grafts).</a><span class='msg-avail'>...<span class='msg-tooltip'>These modules would use (guix grafts) just to access '%graft?' and
related bindings, which are now in (guix store).

* gnu/ci.scm,
guix/gexp.scm,
guix/lint.scm,
guix/scripts.scm,
guix/scripts/archive.scm,
guix/scripts/build.scm,
guix/scripts/challenge.scm,
guix/scripts/deploy.scm,
guix/scripts/environment.scm,
guix/scripts/home.scm,
guix/scripts/pack.scm,
guix/scripts/package.scm,
guix/scripts/pull.scm,
guix/scripts/size.scm,
guix/scripts/system.scm,
guix/scripts/weather.scm,
tests/builders.scm,
tests/channels.scm,
tests/cpan.scm,
tests/derivations.scm,
tests/gexp.scm,
tests/graph.scm,
tests/guix-daemon.sh,
tests/monads.scm,
tests/pack.scm,
tests/packages.scm,
tests/profiles.scm,
tests/system.scm: Remove #:use-module (guix grafts).
</span></span></td><td>Ludovic Courtès</td></tr>