Thunderbird/Add-ons Guide 57
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Add-ons Guide for Thunderbird 57 and beyond
FIRST DRAFT
Mozilla core have disabled "legacy" add-ons (not based purely on WebExtensions) in Firefox 57. Since this type of add-on is not supported from mozilla57 any more, a lot of interfaces have been removed from Mozilla core.
However, Thunderbird 57-59 and Seamonkey still support these addons if the appropriate modifications are done to adapt to the changed interfaces.
These are:
- Removed in mozilla57:
- nsILocalFile -- replacement: nsIFile
- extIApplication, nsIEntityConverter
- nsIProgrammingLanguage
- nsILocaleService and friends
- nsIScriptableDateFormat -- replacement: Intl.DateTimeFormat
- nsIFilePicker.show() -- replacement: nsIFilePicker.open()
- nsIDownloadManager
- Promise.jsm
- nsIPrefBranch2 and nsIPrefBranchInternal -- replacement: nsIPrefBranch
- nsIExternalProtocolService::LoadUrl
- JS and XUL changes in mozilla57 [1]
- `for each ()` construct [2] -- replacement: 'for (x of object)' or 'for (x of Object.values())'
- `with` construct [3]
- catch (ex if ex instanceof ExceptionType) (actually removed in mozilla47 already)
- versioned Javascript support -- replacement: In XUL files, links to JS files using <script type="application/x-javascript" ... > or <script type="application/x-javascript;version=1.7" ... >, change to <script type="application/javascript" ... >
- __iterator__ and Iterator()
- Changes in thunderbird57
- steelIApplication (removed due to removal of extIApplication) -- replacement: Services, AppConstants
- for (x in fixIterator(obj)) (removed due to removal of __iterator__) -- replacement: for (x of fixIterator(obj))
- Removed in mozilla58
- Date.prototype.toLocaleFormat
- {get,set}ComplexValue use of nsISupportsString -- replacement: {get,set}StringPref()
- Mechanism to store add-on preferences in defaults/preferences/xx.js. See bug 1414398. Thunderbird 58 Beta not affected due to backout of this core change.
- Removed in mozilla59
- Inline options. See bug 1419145. Add-ons need to embed a WebExtension to display an options dialog[6][7].
- JS changes in mozilla59 [8]
- catch (ex if ...)