I then used NotePad++ advanced search and replace features.
FireFox suggests a replacement withExEditor that looks like it will do the job however it uses a messaging system on the host (your computer) installed on nodeJS, so the setup is not as simple as I would hope however it may provide additional features at least developers may want to use, and may offer some ways to integrate with the desktop.
Here is the blurb from the plugin, which I will install and report on sooner or later.
From the context menu (right click), you can "View source" "View selection" or "Edit text" with your favorite editor."View source" "View selection" or "Edit text" with your favorite editor.
Enabled in (X)HTML, JavaScript, CSS, MathML, SVG, XML, etc.
Requirements:
To use withExEditor, you also need to prepare a host which executes your editor.
The browser interacts with the host via messages, and the editor is executed by the host.
Context Menus:
* View Page Source with exEditor
Creates a copy of the page, save as a temporary file, and opens it with an external editor.
If you are browsing a local file, then the local file will be opened directly.
* View MathML Source with exEditor
Enabled on MathML elements, and shows a generated DOM tree.
* View SVG Source with exEditor
Enabled on SVG elements, and shows a generated DOM tree.
* View Selection with exEditor
Shows a generated DOM tree of selection in XML format.
If there are multiple ranges in selection, each range will be shown with a comment as a delimiter.
If the selection is not DOM parsable (like JavaScript, CSS), a file that contains only the range of text selected will be created.
* Edit Text with exEditor
Enabled on input elements, textarea element and editable elements.
Edited contents will be synchronized when you go back to the browser and move focus to the element which you've edited.
Options:
The following items can be set.
* Choose toolbar button icon.
* Configure access key.
* Choose whether to enable during private browsing.
* Choose whether to enable only when content is editable.
* Choose whether to enable automatically synchronize edited content on specific sites.
Regards
Tony