I can't post comments, whether they're on my own posts or another user's posts. When I try press the 'Add comment' button, nothing happens. I'm also not using any script blocking browser plugins like NoSpace. I meet the reputation requirements. Why is this happening? Is it something to do with the web browser I use? I use the Amazon Kindle Experimental Web Browser. Thanks!
The browser you are using is not in the list of supported browsers, or even in the list of browsers that are not officially supported but seem to work anyway. As this seems to be a client-side issue, it is likely that there is simply some incompatibility between Stack Exchange's code and your browser.
We do not support browsers in beta/alpha or experimental states.
Please use one of the supported browsers.