Tut was es soll. Ist aber irgendwie dämlich programmiert:
Die erste Bestätigung der Rechte bewirkt gar nichts, man nochmals rechts oben auf das Addon-Symbol klicken oder in den Berechtigungen einstellen.

Aber warum kann man diese Berechtigung abschalten, wenn das Addon dann nicht mehr funktioniert? Das erschließt sich mir nicht. Und dann muss man erst mal drauf kommen, dass man ein 2. Mal was einstellen muss. Man hat ja schon bei der Installation was bestätigt.
Intuitiv geht anders.

1. There is no option for automatically translating selected text without having to click on the DeepL icon. This feature exists in other translation extensions (e.g. Simple Translate).

2. When you try to translate a text written in your native language, DeepL does not automatically translate it into a pre-selected language, but simply recopies the text, which is obviously pointless.

3. I tested the "write with DeepL" function on Reddit, but it's still too buggy and I didn't manage to use it.

4. DeepL still does not support Esperanto, which is the most widely spoken international auxiliary language in the world, with around 2 million speakers (in comparison, Estonian, supported by DeepL, is spoken by around 1.1 million people).

Deepl, is the most accurate system for translation.
Unfortunately, the add-on is not really useful. Lots of stuff is missing. For example the option to immediately display popup to Auto Translate on mouse selection in the Pop-up Bubble...
Dear developer, have a look at ImTranslator add-on, you will get some inspirations.
Thanks anyway. It's a good start.

This is puzzling. I can select text on a page and get a translation (albeit with a popup that won't go away) but there's no icon for translating an entire page. I've tried on both a major German newspaper and on a Danish science magazine, and there's nada. I've restarted my browser, although not my machine.

A nice add-on that does only the one thing it's meant to but this is done very good. And no third party software needed anymore where different APIs can be used.
Only the shortcut does not work for me, it always opens the Firefox library (German keyboard layout) and I experienced some glitches in online forms: when I entered text and then hit backspace the former text was still visible and new text was simply written over it which was pretty unreadable - turning off this add-on removed this behavior and turning it back on brought back the error so i suspect it's this add-on. Would be 5/5 if the key combination could be changed and the text glitches were gone.

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