yes, you are correct.
the run > launch in [browser name] have been disabled for default installs, due to data security concerns if you e.g. have an infected browser on your pc.
the activation of launch in [browser name] has been made optional.

here’s the complete guide from @PeterJones on how to re-enable them, as well as how to additionally implement “Launch in Edge” to your run menu, in case you are using windows 10:

@PeterJones wrote:

The Run Menu usually contains the Launch in Firefox/Chrome/IE/Edge entries.

They are defined in the shortcuts.xml configuration file. If you have a normally-installed Notepad++, you can edit them at %AppData%\Notepad++\shortcuts.xml; if it’s a portable, or any installation that doesn’t use AppData, it will be in the same directory as notepad++.exe itself. A caveat for editing that file: exit all instances of Notepad++ (to make sure all settings are saved); then open Notepad++ and edit the shortcuts.xml file, save and exit Notepad++. The next time you open Notepad++, the changes will have taken effect.

Mine has Firefox and Chrome. This post shows one with Firefox, Chrome, and Internet Explorer, and explains that in the most recent versions, those entries are commented out (don’t know why, sorry). Microsoft Edge behaves differently (because Microsoft), and won’t let you just give the path to the Edge browser executable, so see this post here for how to add Launch in Edge.

So, combining the advice from both posts:

    <UserDefinedCommands>
        <Command name="Launch in Firefox" Ctrl="yes" Alt="yes" Shift="yes" Key="88">firefox "$(FULL_CURRENT_PATH)"</Command>
        <Command name="Launch in IE" Ctrl="yes" Alt="yes" Shift="yes" Key="73">iexplore "$(FULL_CURRENT_PATH)"</Command>
        <Command name="Launch in Chrome" Ctrl="yes" Alt="yes" Shift="yes" Key="82">chrome "$(FULL_CURRENT_PATH)"</Command>...
        <Command name="Launch in Edge" Ctrl="yes" Alt="yes" Shift="yes" Key="69"> shell:Appsfolder\Microsoft.MicrosoftEdge_8wekyb3d8bbwe!MicrosoftEdge $(FULL_CURRENT_PATH)</Command>

(There may be other entries in the <UserDefinedCommands> section before or after these; I just included the start-tag to tell you where in the file to add the launch-in-browser commands)

If you know the full path to another browser that you want to use, you can add another row similar to those, but with

        <Command name="Launch in SuperSecretBrowser" Ctrl="yes" Alt="yes" Shift="yes" Key="0">&quot;c:\path\to\browser.exe&quot; &quot;$(FULL_CURRENT_PATH)&quot;</Command>

If you want to change the shortcuts, go to Run > Modify Shortcut / Delete Command

note: for more details, please visit the original thread >>> here <<<