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Hello Timur, It was all PDF files that would give the same error, but worked in Firefox. (Excel for example were ok). But after a refresh this morning they are all working in bot Firework and Firefox. Sorry for the inconvenience.
Customer support service by UserEcho
Extensions is the only thing keeping me from getting the full version and switch all my workflow to Firework. Many of the web-app I use unfortunately do not have a native Dark Theme for which dark reader fixes. That would also fix the annoyance of no password management. Can't wait for news on progress for this. Thanks