On October 18, the BBC reported that
At the EU summit, French President Emmanuel Macron led a small number of countries in rejecting the Western Balkan countries from moving forward with their membership bids. He was joined by Denmark and the Netherlands in refusing Albania but France alone rejected North Macedonia. All EU states must agree before approval is given for membership talks to begin.
The French decision to veto the opening of talks with these was criticized even by Juncker as a "historic mistake" even though (in 2014) Juncker had pledged there would be no actual EU expansion during his tenure as Commission president (although Juncker said even then that expansion talks should continue).
According to an opinion poll by Ifop published two days before the elections, however, 44% of those who supported the Yellow Vest movement said they would vote for the far-right National Rally (RN), with only 4% declaring they’d vote for President Emmanuel Macron’s La République en Marche (LREM).
“Very clearly, the ‘Yellow vests’’ true political outlet in these EU Parliament elections is the RN”, PollingVox president Jérôme Sainte-Marie argued.
As for the actual results of those EU elections in France
[RN] won in the rural, depressed and deindustrialized areas of northern, south-central and eastern France that spawned the six-month Yellow Vest revolt that shook Mr. Macron’s presidency.
And Macron couldn't have been completely insensitive to these facts. So, are there some recent polls in France on the [im]popularity of further EU enlargement, and preferably on enlargement in the Balkan countries in particular?