I am looking for a solution to override an inline style on a specific webpage within the Firefox browser without access to the source code. Previously, I would manually modify the page source using Firefox development tools.
Specifically, I encounter a webpage with a file upload form where the "submit" button is set to have a visibility of "hidden". The inline style that needs to be overridden is:
<input type="submit" name="submit" value="Upload selected file" style="visibility: hidden">
Is there a way to permanently change the visibility of this submit button within the Firefox browser? I remember a Firefox extension that could achieve this, but I can't seem to recall its name...