Menu items in the View menu was been gradually removed in the version up of Firefox.
In Firefox version 25 was released on October 29, 2013, it removed menu item "reload".
Because Mozilla said "reload" is not so useful, you can get more detail at "Bug 513168 - Remove "Stop" and "Reload" from View menu"
I(developer) am usually using touch typing, So I feel very inconvenient about "reload" had been removed.
Because I can type key sequences Alt -> v -> r with almost unconsciously to update(reload) page .
I know that I can update(reload) page in press F5 , but I don't like to use function keys.
Therefore, I developed this addon "Comeback View Menuitems" to revive the two menuitems "reload" and "page source" in view menu.
And I know a method of support multilingual "How to localized (multilingual) addon that created in the Add-on Builder".
So I extracted menuitems from old version of language packs for support approximately 90 languages.
Sometime swap menuitem position "Reload" and "Page Source".
I think a cause is add menu item is processed in asynchronous.
I'm trying to fix this.