Unnecessarily persistent background in Firefox #167
Description
Neither Stardown's Chrome nor Firefox manifests specify whether the background should be persistent, which means the Firefox version (which uses manifest v2) is persistent while the Chrome version (manifest v3) is not persistent (source: background - Mozilla | MDN). Stardown seems to work well in Chrome, so the Firefox version should probably be changed to not be persistent.
This change may have a side benefit in the future. Stardown currently doesn't listen for the onUpdateAvailable event, but it might someday. The quote below is from the Chrome docs but has a decent chance of applying to Firefox too.
If your extension is using a persistent background page, the background page of course never gets unloaded, so unless you call chrome.runtime.reload() manually in response to [the onUpdateAvailable] event the update will not get installed until the next time Chrome itself restarts. If no handlers are listening for [the onUpdateAvailable] event, and your extension has a persistent background page, it behaves as if chrome.runtime.reload() is called in response to [the onUpdateAvailable] event.