Installed LanguageTool for Libre Office Writer, but find LT even more useful when filling out web site message fields, like this one, in Firefox. In Writer, the squiggly red underline is enhanced, and grammatical errors are flagged by LT with a different color squiggly underline. In most text entry windows in Firefox, the underlines are solid, and clicking on the word or phrase brings up alternative spellings or edits, or occasionally a suggestion of fixing things.

With squiggly underlines, right-click on the word as usual to get a drop-down menu of corrections. With solid underlines, left-click on it to get spelling, grammar, or style corrections or suggestions. I recommended LT for anyone who wants more than built-in spell checking.

awsome app

The plugin checks for tens of seconds to a minute, and sometimes does not work at all. Perhaps this is because the location is Russia with fenced Cheburnet, but it became impossible to use the plugin.

the add-on slows down the browser way too much. There's an unacceptable long delay between typing letters and the apperance in a text box.

Refuses to work no matter what I do. I have tried Restart Firefox, delete and reinstall the extension, Delete the extension then uninstall Firefox then reinstall Firefox then the extension. Nothing worked.

lack dictionary feature. I wanted dictionary features similar to grammarly.
reply:
Plz see grammarly what I wanted to say here ''Show definitions and synonyms
via double clicks (all sites)'' I want this feature.