Eliminate popup window for firefox web console autosave.

autosaveIndicator is appended to content.document just like for autosaveElement.
Needs testing in chrome, logic needs improvement for firefox scratchpad environment sanity checking.
TODO: Inform user to switch Scratchpad to Browser environment to autosave console. Inform user to close console in Context environment.
Make ESLint clean in eclipse orion.

Format JS.
Restore chrome devtools popup logic for further testing there.
Fix cs.display.match(/block/) which also matches inline-block.
Merge popupFeatures and opacity animation from latest Google Chrome snippet.
Remove autosaveElement code, removeAttribute('href') after download.

Need to remove attribute after click event, else download won't happen.
Increase autosave limit to 50 characters so a 41 character blob references added to the log by clicking the download link does not trigger another autosave.
Could not get requestAnimationFrame to work, still using setTimeout.
Mention Mozilla Firefox support.

Use active voice.