"Save recent work" is a very convenient feature to use, when you get interrupted or if you accidentally closed the translation application with an important work.
When you leave or close the translation application, your last work will be saved in the translation window in ImTranslator and Pop-up Bubble applications.
The option "Save recent work" is enabled by default for ImTranslator application.
In the Pop-up Bubble Translator this option is not default.
If you check this option, the Pop-up Bubble will be pinned to the right side of a webpage with the translated text displayed in the pop-up window. You can scroll the webpage, copy the text inside the pop-up bubble, listen to the voice, open another tab, the pop-up window will stay open with your latest text until you press the Close button.