Viewing markup of question/answer/comment, of one for which is editing is not allowed.

Question

Is there a way to see the markup of questions/answers/comments for which editing is not allowed?

This answer says to right-click and select Show source. It looks like this method doesn't exist anymore, using Firefox at least.

The page's source html can be seen from Firefox's Web Developer menu. This allows to see the MathJax, but other Markup formatting has been replaced by the text being structured using the html tags.

Using the edit link in questions allows to see the original Markdown. Although, this sometimes doesn't work when there is a suggested edit awaiting approval. It looks like other people's answers also don't show the Markdown by pressing edit. Finally, comments lose the edit link after some time. I wonder why editing doesn't get disallowed upon submitting instead of upon request. For example, a question/answer/comment could keep its edit link functioning and showing the source Markdown, while not allowing the edit to be submitted, and perhaps displaying a message that edits will not be accepted.

Answer 1

For posts you can go first to revision history of the specific post. And after that click on view source. This was suggested in this answer: Can you copy paste tex code from the question without going the “view source” route?

How to get to the revision history: If the post in question was edited it suffices to click on the timestamp. But for any post (edited or not) the link of the form http://math.stackexchange.com/posts/{id}/revisions works, where {id} is the id of the post. (And of course math.stackexchange.com has to be replaced by the relevant site, for example, here is link to revisions history of your question on meta: https://math.meta.stackexchange.com/posts/28616/revisions. You can find more information on this in the posts linked in the edit-history tag-info.

For comments, I'll add links to other questions which discuss this: Is there a way to view a comment's source? and How to copy mixture of text and latex formulas in a comment?

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Regarding the answer you linked: Math markup, diagrams, etc. — pointers please

The page's source html can be seen from Firefox's Web Developer menu. This allows to see the MathJax, but other Markup formatting has been replaced by the text being structured using the html tags.

Yes, this is exactly how viewing source of a page is supposed to work. Since the linked question asks about math markup (MathJax), perhaps the suggested answer is not completely unreasonable. (Although there are other possibilities, which might be considered simpler.)

I will add that some html syntax works also in posts, so if you copy-past part of the html code of a question/answer/comment (rather than trying to convert it to MarkDown), there's a good chance that it will display correctly.

For example this is what I get viewing source of this page from one paragraph in your question:

<a href="https://math.meta.stackexchange.com/a/482/569197">This answer</a> says to right-click and select <code>Show source</code>. It looks like this method doesn't exist anymore, using Firefox at least.

This answer says to right-click and select Show source. It looks like this method doesn't exist anymore, using Firefox at least.

Another possible interpretation of that answer is that the answerer meant Show Math As/TeX Commands in the MathJax context menu. (Which you get after right click on a renderer formula.) I will add a link to an answer about a different issue which contains a screenshot: Simple Alignment to the Left.