What are we looking for?
This guide will help you identify customizations that could possibly be impacted by the UI/UX Redesign in the overall header and footer contains and layouts.
Header Customizations
| 
 Overall header container files  | 
custom/clients/base/layouts/header/header.php custom/clients/base/layouts/header/header.js custom/clients/base/layouts/header/*.hbs  | 
| Module list files | 
 custom/clients/base/layouts/module-list/module-list.js  | 
| Quicksearch files | custom/clients/base/layouts/quicksearch/quicksearch.php custom/clients/base/layouts/quicksearch/quicksearch.js custom/clients/base/layouts/quicksearch/quicksearch.hbs custom/clients/base/views/quicksearch-modulelist/quicksearch-modulelist.js custom/clients/base/views/quicksearch-modulelist/*.hbs custom/clients/base/views/quicksearch-taglist/quicksearch-taglist.js custom/clients/base/views/quicksearch-taglist/*.hbs custom/clients/base/views/quicksearch-bar/quicksearch-bar.js custom/clients/base/views/quicksearch-bar/quicksearch-bar.hbs custom/clients/base/views/quicksearch-tags/quicksearch-tags.js custom/clients/base/views/quicksearch-tags/quicksearch-tags.hbs custom/clients/base/views/quicksearch-results/quicksearch-results.js custom/clients/base/views/quicksearch-results/*.hbs custom/clients/base/views/quicksearch-button/quicksearch-button.js custom/clients/base/views/quicksearch-button/quicksearch-button.hbs  | 
| Notifications files | 
 custom/clients/base/views/notifications/notifications.php  | 
| Profile dropdown files | 
 custom/clients/base/views/profileactions/profileactions.php  | 
| Quick create files | 
 custom/clients/base/views/quickcreate/quickcreate.js  | 
Footer Customizations
| Overall footer container files | custom/clients/base/layouts/footer/footer.php custom/clients/base/layouts/footer/footer.hbs  | 
| Footer logo side files | custom/clients/base/layouts/footer-logos/footer-logos.php custom/clients/base/layouts/footer-logos/footer-logos.js custom/clients/base/layouts/footer-logos/footer-logos.hbs custom/clients/base/views/omnichannel-button/omnichannel-button.js custom/clients/base/views/omnichannel-button/omnichannel-button.hbs  | 
| Footer button side files | custom/clients/base/layouts/footer-buttons/footer-buttons.php custom/clients/base/layouts/footer-buttons/footer-buttons.js custom/clients/base/views/mobile-action/mobile-action.js custom/clients/base/views/mobile-action/mobile-action.hbs custom/clients/base/views/merge-widget-action/merge-widget-action.js custom/clients/base/views/merge-widget-action/merge-widget-action.hbs custom/clients/base/views/language-actions/language-actions.js custom/clients/base/views/language-actions/language-actions.hbs custom/clients/base/views/footer-actions/footer-actions.js custom/clients/base/views/footer-actions/footer-actions.hbs custom/clients/base/views/footer-actions/footer-actions.php  | 
Scripts
Set of scripts to help you easily identify any customizations in your filesystem or any addon/MLP you may have created or installed in your instances.
Search for MLPs
Copy all of your addons/MLPs into a directory in their zip format and execute the following script.
It unzips the files in-place, scans for possible customizations and if any is found, it returns its name (zip filename).
#!/bin/sh
find . -name *.zip |
while read filename
do
    path=$(echo $filename | sed 's/ /\\ /g')
    if ( unzip -c "$filename" | grep -i -q "clients/base/layouts/header\|clients/base/layouts/module-list\|clients/base/views/module-menu\|clients/base/layouts/quicksearch\|clients/base/views/quicksearch\|clients/base/views/notifications\|clients/base/views/profileactions/\|clients/base/views/quickcreate\|clients/base/layouts/footer\|clients/base/views/omnichannel\|clients/base/views/mobile-action\|clients/base/views/merge-widget-action\|clients/base/views/language-actions\|clients/base/views/footer-actions"); then
            o1=`ls -l "$filename" | awk '{print $6,$7,$8}' | column -t`
            o2=`echo "$filename" | sed 's|^[^/]*\(/[^/]*/\).*$|\1|' | sed 's|/||g'`
            echo "$filename" | column -t
    fi
done