Tested with Vimium C master (BTypes = Firefox) on Firefox 69.0a1 (64-bit, Win 10), I can not reproduce it.

What's your settings of "New tab URL"? Maybe recent Firefox disables more URLs - as far as I know, Vimium C can not create a tab of file:/// or about:debugging.

Reference of browser.tabs.create: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/tabs/create , the url sub-section.

My Firefox Add-ons get automatically updated so I think it come from the store.

The above is what I get when i try to inspect into the extension.

The reason that I asked the version of Vimium C is you said this in this issue:

• 1.75.7 Vimium-c Chrome stable

• Just in case you got a mismatched version.

what I get when i try to inspect into the extension

A strange bug. I once tested those URLs and about:newtab should be OKay. Are you using another web-extension to override the Firefox's NewTab URL setting?

I'll do more tests on latest Firefox in days.

Confirmed as a bug, and 7eabcc5 should fix it. I'll publish a new version in days.

v1.75.8 has been released on Firefox Add-ons. You may have a try.

I am on 1.75.8 right now and can confirm that I can use 't'

However when open a new tab (firefox) with 't' or Cmd + T, the url bar is filled instead of being empty

• "moz-extension://9a678822-07c0-d04a-bff7-cb09a8e380da/pages/blank.html" when leave at default configuration
• "about:blank" when try to force save "about:blank" (and yes, this works for Firefox Nightly for some reason despite the warning message of Vimium when you save the Options page

Um... You're right, about:blank is not forbidden by Firefox.

But, the fact is that Firefox has "too strict" limitation on URLs that web-extensions want to open, and about:home is indeed forbidden on Firefox 67.

The URL in address bar is because:

• up to now, Vimium C declares that its "new tab page" is "/pages/newtab.html"
• if the newtab.html is opened, it will load the value of Vimium C's "New Tab URL" option and try to open it.
  • there's no way to read a browser's previous New Tab page settings.
  • a side effect of this "trying to open" is the target URL is shown on the address bar.

There have been so many discussions and complaints about Vimium C's behavior of overriding New Tab, so I've planned to split this feature into another web-extension (Some discussions in Chineses may be seen in #47). It will be in Vimium C v1.76.*** or v1.77.

Complain tickets on Extension limitation on URL bar for Firefox: https://bugzilla.mozilla.org/show_bug.cgi?id=1409675

Possible solution (WIP) ticket: https://bugzilla.mozilla.org/show_bug.cgi?id=1460412

@gdh1995 I am using 1.77.2 on Firefox and am still having this issue. I thought this might have been fixed in 1.77 since new tab is no longer being managed, but t is still not working for me. Is this possible to fix? Thanks.

Some URLs are refused by Firefox to open from an extension. So what's your chosen NewTab on Vimium C Options page?

It's the default about:newtab.

@meluskyc Vimium C v1.77.3 has been released on Firefox Add-ons, and you may try it again.

There's a hidden logic bug and it was exposed in v1.77.0, because of not managing browser's NewTab.

Fixed. Thank you!