Currently not really useful due to https://bugzilla.mozilla.org/show_bug.cgi?id=1409675

after opening new tab it takes 1-2 seconds for New Tab Override to load before it can be used.
too long for me, it breaks my flow. when i open new tab i want to start typing my search right away (same as in default empty new firefox tab).

What's the point if the url bar is already filled and each time I have to clear it first to browse

I'm sure this works great for what it was designed for. However, I build my own Home Page using images on my harddrive as my link, not text. Because New Tab Override cannot load local images it's pointless.

Storing html file in extension does not work.

Will not allow loading local files on Ubuntu / Linux.

No, "Mozilla doesn't allow this functionality" is not an answer. I have a different extension, with the same local file, working perfectly fine on Windows 8.1 but it refuses to load on Ubuntu. This extension doesn't even make an attempt to load the file. It's HTML, CSS, JS so the semi support doesn't work (and isn't a real fix because I want changes to be made immediate which is why it's a local file in the first place). The only use I have for this extension does not work so it is immediately uninstalled.

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Edit: I don't think I can reply to developer comments so I will here instead.

Firstly, I don't need to make a GitHub issue because this isn't GitHub. This is the review section of mozilla.org where I review the extension I downloaded that doesn't do what I wanted it to. Secondly, I did say exactly what is wrong. If the path does not start with http:// or https:// the extension refuses to load without even trying. This is not a technical reason, this is a developmental choice and why the other extension loads on Windows (because it doesn't give up the moment I input my file path). Lastly, the other extension works on Windows 8.1 and 10 merely by inputting file:// (path to file) despite it too saying it's not supported. The steps to reproduce the two star review are: 1) choose new URL 2) input anything that's not http:// or https:// 3) immediately uninstall and leave a poor review reflecting this design choice.

Thank you for making the extension (I didn't rate it one star) but the extensions design choice makes it unusable for local file hosting which works despite it not being officially supported. All I need(ed) it to do was auto open an HTML file from my machine (not cache but actually open to access ./css, ./js, etc) but I have since worked around this issue.

I used this extension. At first, it was good and it gave me a blank new tab as I wished. Unless it occupied a huge space in the address bar (that even I could not sometimes find the actual address on the net), I was satisfied. But, after two weeks, I saw my Firefox working terribly, all icons were trembling when I was opening a new tab, it was truly irritating! After I removed this extension I saw Firefox is OK again. I do not know why it happened, just I know there was something wrong.

This web extension has too much clutter and makes the process more complicated than needed.

Deactivating the extension replaces the current tab content by a default new tab, destroying all data one is working on and even literally erasing the tab from tab history (no way to use Back). Activating the extension instead closes the current tab. Even now, the tab is completely lost in the void, because ctrl+shift+t causes a "new tab" be opened INSTEAD of the previously closed tab. (EDIT: The previously closed tab is only lost due to a hazard when I press ctrl+shift+t twice very fast.)

Other than that, the addon does what it has to do, and I appreciate the option to gain tab focus instead of the navigation bar. One last thing i'd find very useful is if typing into the address bar before anything gets loaded postponed the process of replacing address bar (deleting anything I've typed) and taking the focus away. Not sure if firefox even provides so much API to achieve this.

// Reply: Well the issue is critical and deserves at least an acknowledgement in the description, as it's an anti-feature. Honestly though, I haven't seen WebExtensions implementation, but I don't believe you at all. I can imagine several workarounds, neither of them were even considered. Is there no API whatsoever to access the last closed tab history, so that you can offer a way to manually re-open the lost tab? Is there absolutely no way not to process your addon when the user presses Ctrl+Shift+T? Is that specific event impossible be detected? Can you not let the default implementation (optionally) load first before redirecting to the user specified site? Also the issue could be reported to WebExtensions devs... Completely blocking the "re-open last tab" support is definitely not acceptable as a final decision. (But I know the WebExtensions suck, there are so many other addons that no longer work even in theory in the new Firefox.)

-> Okay so I decided to try to fix my issue myself and even though I found a WebExtensions solution, there was a bug that I couldn't fix. Still, some safety workarounds could be made. Luckily, I found a workaround instead: disabling the focus setting solved the issue, because it still focuses the new page anyway (the setting is broken), thus it works exactly as I wanted. The referenced issue is here: https://github.com/cadeyrn/newtaboverride/issues/167

It works but often it is slow. I click the new tab icon and then the tab opens and it takes a few seconds to redirect to my homepage. This is annoying when it happens so often. Firefox should have this feature built in!

Option "local file" doesn't work, "current home page" doesn't work when home page is local file.