Quickly Copy-Paste Plain Text From Web Pages Using This Firefox Add-on
When selecting text to copy-paste from web pages, it can be useful to copy them as plain text without any sort of formatting. Copy PlainText is a Firefox add-on that makes it easy to do so.
Download and install it from here.
After it is installed, you can also set it to run in Private Windows if needed.
Using it is simple. To copy text from web pages, select it and right-click.
Then click on Copy...