Background: I am running Elementary OS 5.0, Firefox 64.0 I have asked similar question on a Duckduckgo's subreddit already, and I have received a response saying that it might be an issue with plugins that might be interfering, or Firefox itself. I cannot control text inside search box of Duckduckgo on Firefox; using shortcuts like Ctrl+A, Ctrl+Shift+Left/Right, Ctrl+Left/Right causes some behaviour or text selection to happen, outside the text box that was active at the time when shortcuts were performed (I have tested with all plugins both disabled and enabled, and with shortcuts turned both on and off in duckduckgo's settings). I am not sure if it is an issue with Firefox itself because same shortcuts seem to work in google search box. On the other hand, I have also tested said shortcuts on both search engines on Chrome, and I didn't encounter such issues. Thanks in advance!