Too bad in this sub there is no possibility to add flair, 'solved' would have been appropriate. Thank you very much for coming back with a suggestion. Tried composing some mails on /outlook/ex-hotmail and Yahoo, no problem. all of that leads me to conclude that this is not the best way to insert text. Using a for loop to go through each lections instance also did not work for me, additionally it has other quirks, like how it leaves the text selected afterwards, so you will accidentally type over the inserted text, etc. Guess what, nothing works, Savetext alone doesn't do the trick. This only works for a single cursor (even the code in the example). OK I thought, PersistenText is not needed, uninstalled. Idem when I tried composing in a new window or closed the browser. Installed Savetext - Hey, this works!!!! Began composing a reply, closed the tab, reopened the tab, text came in automatically.

solving chrome- extension firefox - extension opera- extension recaptcha. Started with Persistent Text - checked 'Show a confirmation box' instead of 'Use a toolbar' in Settings: well, here on reddit a small Java window appears asking to restore a saved text after closing/reopening a tab or a window, but nothing comes afterwards. DoubleClick event to fire before an in-place editor is activated. Here is how I proceeded, hope it can help somebody else. None of the two extensions taken separately do what is expected.

Opera extensions text editor