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You could specify the element you want to modify with the Firefox browser toolbox:
https://firefox-source-docs.mozilla.org/devtools-user/browser_toolbox/index.html
You could specify the element you want to modify with the Firefox browser toolbox:
https://firefox-source-docs.mozilla.org/devtools-user/browser_toolbox/index.html
A place to discuss the news and latest developments on the open-source browser Firefox