Updated comments and readme.

README.md

-# Safelinks Cleaner MailExtension
+# Microsoft ATP Safe Links Cleaner for Thunderbird
 
-This project is a MailExtension that cleans up display of Microsoft
-Advanced Threat Protection Safe Links.
+This Thunderbird extension cleans up the display of links rewritten by
+Microsoft Advanced Threat Protection. Unlike many similar extensions
+it does not change the links, but does ensure that they are displayed
+in such a way that the original link is accessible.
 
-* Displayed plain text links are replaced by the original link.
+* Links in plain text email are changed so the original link is
+  displayed.
 
-* A tooltip is added to all rewritten links to display the original link.
+* A tooltip showing the original link is atted to all rewritten links.
 
+* The context menu for rewritten links has a "copy original link item".
 
-## Development
+* When responding to a message, rewritten links are replaced by the
+  original links.
 
-Documentation on add-on development:
-
-* https://developer.thunderbird.net/add-ons/about-add-ons
-
-Debugging Thunderbird extensions (ue Ctrl+Shift+I):
-
-* https://developer.thunderbird.net/add-ons/tips-and-tricks
+## Known issues
 
+* Since only the *display* is changed, links that have the URL as the
+  link text will now have link text that differs from the link target.
+  Thunderbird picks up on this when you click a link and asks if you
+  want to visit the original link or the safe link. Due to the way the
+  tooltip is constructed, visiting the original link will most likely
+  fail. This is not by design and may change in the future.
 
+* When composing a message the original links are restored. This
+  process could potentially change text that isn't meant to be
+  changed but looks almost like a valid safe link.

extension/background.js

+// Microsoft ATP Safe Links Cleaner
+// Copyright 2021 David Byers <david.byers@liu.se>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+// Background scripts
+
+
 browser.composeScripts.register({
     js: [
 	{file: "common.js"},

extension/common.js

+// Microsoft ATP Safe Links Cleaner
+// Copyright 2021 David Byers <david.byers@liu.se>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+// Shared code
+
+
 const safelinksRegexp = new RegExp(
     'https?://[^.]+[.]safelinks[.]protection[.]outlook[.]com/[?]url=([^&]+)&.*',
     'gi'

extension/compose.js

-// Modify the displayed message to clarify where safelinks are
-// inserted and to show the actual link targets.
+// Microsoft ATP Safe Links Cleaner
+// Copyright 2021 David Byers <david.byers@liu.se>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+// Compose script
+
 
 for (const link of document.links) {
     if (isTangledLink(link.href)) {

extension/display.js

-// Modify the displayed message to clarify where safelinks are
-// inserted and to show the actual link targets.
+// Microsoft ATP Safe Links Cleaner
+// Copyright 2021 David Byers <david.byers@liu.se>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+// Display script
+
 
 for (const link of document.links) {
     // Mangle the link text

extension/manifest.json

@@ -4,7 +4,7 @@
     "description": "__MSG_extensionDescription__",
     "version": "1.1",
     "author": "David Byers",
-    "homepage_url": "https://safelinks.gitlab-pages.liu.se/safelinks-cleaner-mailextension/",
+    "homepage_url": "https://safelinks.gitlab-pages.liu.se/safelinks-cleaner-thunderbird/",
     "default_locale": "en",
     "icons": {
 	"48": "icon.svg",

extension/style.css

+/*
+Microsoft ATP Safe Links Cleaner
+Copyright 2021 David Byers <david.byers@liu.se>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
 a:hover .liu_safelinks_tooltip {
     display: block;
 }